**The new Raspberry Pi bootloader is out which makes these instructions only necessary if you want to continue to use the SD card as a bootloader. View the Raspberry Pi Bootloader Configuration Guide here!**
The Raspberry Pi 4* is finally here and has a lot of exciting changes. One very major downside is that it doesn’t support true USB booting yet out of the box (like the 3 series did). The Raspberry Pi foundation states that it is being worked on and will be added back with a future update. No timeline has been given yet for that to happen but they state it’s one of their top priorities.
Most of my projects heavily depend on having good performing storage so sitting and waiting was not an acceptable solution. In this guide I’ll show you a workaround to use USB devices as your rootfs device and use a Micro SD card as bootloader only which gives us full SSD performance after boot! To see exactly how much of a performance difference this makes (spoiler: it’s gigantic) check out the Raspberry Pi Storage Benchmarks.
I highly recommend doing this on a completely new install. If you try to upgrade your old ones and something goes wrong there’s a good chance you might lose data. We will be modifying the boot partition, resizing partitions, etc. so don’t use a drive with any data on it unless you are positive you have all of the steps down!
Compatible USB Adapters
The Raspberry Pi 4 is proving to be picky about what SATA, M.2, etc. adapters will work in the USB 3.0 port. The USB 3.0 ports are the ones in the middle that are blue inside. The black ones are USB 2.0 and won’t give you the faster speeds the new Pi offers.
It’s very likely that some of these will be fixed via software and firmware updates and the Raspberry Pi Foundation has several open known issues related to USB 3. Until that happens though I will maintain a list here of known working ones and known problematic ones. It’s still very early in the release of the Pi 4 so we still have a lot to learn about which adapters work / don’t work. If you have working and nonworking adapters leave a comment and I’ll add it in this list.
If the adapters worked before on older Pis then one thing you can try is putting them in the black USB 2.0 ports. Obviously this is stupid because we all want the Pi 4 performance gains but if you end up needing to buy a new adapter this will give you a workaround until a replacement arrives!
Find USB adapter chipset
There are certain chipsets used in adapters that are known to be working/not working.
pi@raspberrypi:~ $ lsusb Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 002: ID 174c:55aa ASMedia Technology Inc. Name: ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
This is a lsusb dump of all my connected USB devices. I have bolded the line with the USB bridge device. We can see that the chipset is ASM1153E. This is a really common one that works well with the Pi.
The new USB-C 3.1 Type A version of the Sabrent adapter is reported as working in the comments by UEF. DO NOT get the USB 3.0 version as that one is below on the naughty list and won’t work!
Make absolutely sure it’s the 10Gbps USB 3.1 Gen 2 version. There is another one that looks identical that is a USB 3.1 Gen 2 6Gbps that will not work. Confirmed working by RRT in the comments.
It’s bold. It’s beautiful. It’s also confirmed working by TADRACKET and Steve B. However, be warned, it takes a *lot* of power! Steve B. reports that even with the oversized 3.5A CanaKit adapter* it does not work. If you have the standard 3.0 adapter you can be practically certain it won’t power this enclosure. Does work with a powered USB hub*.
Returning legendary commentary Frank Meyer reports: Does not work with a 3.0A power adapter (also reported by TTE). It’s not enough power for this enclosure. Does work with a powered USB hub*.
M.Yusuf has given the first ever report of a working Orico adapter! Make sure it’s the USB 3.1 Gen 2 version that says “Support UASP for NVMe SSD”. This is the way.
Canakit has been making very reliable power supplies for several Pi generations now. Using a 3.5A power supply will give enough extra power for your Pi to power the drive without causing instability
Reported as working by JeffG but with an ugly messy appearance
Known Working Adapters
Known Problematic Adapters (Naughty List)
Here is a list of common USB adapters that are known to have problems with the Raspberry Pi 4. You can get some of these adapters working by using quirks mode (see the “Fix (some) USB Adapter Problems Using Quirks” section below).
Only works in the USB 2.0 ports. Will not boot in a USB 3.0 port. I have two of these and can confirm they don’t work. RIP to Sabrent, our previous king of the Pi 3 era of adapters.
Despite earlier reports as working Ryan and one other have reported this adapter does not work unless you enable quirks mode! Don’t make Ryan’s sacrifice in vain and avoid this one.
Extremely cheap adapter from AliExpress — MADATALIEXPRESS bought 5 of them and none worked, PPCM had one working, very unreliable and slow when it does work, not recommended even if you get lucky!
The Samsung 980 Pro (NVMe) is a professional grade SSD and one of the fastest in the world. The Samsung NVMe drives have been at the top of this category for a long time and are well trusted for both their performance and reliability / long life.
The ICY BOX is basically a giant heatsink that you mount a high performance M.2 NVMe drive inside of. This enclosure is really fast but requires a powered USB hub. Not even the 3.5A adapter can reliably power it! The enclosure works well and will physically feel warm to the touch as it is pulling the heat off your NVMe drive!
The Kingston A400 has been a great drive to use with the Pi for years. It’s reliable, widely available around the world, has low power requirements and performs very well. It’s also very affordable. This drive has been benchmarked over 1000 times at pibenchmarks.com and is the #1 most popular SSD among the Pi community!
The SanDisk Extreme Pro USB SSD is a true solid state drive. This is different than a typical “flash drive” which uses extremely cheap memory and has very low random I/O performance/throughput compared to a real solid state drive. I’ve used both the USB 3.1 and USB 3.2 variants with the Pi successfully and they benchmark very well!
You may use other types of drives with the Pi such as M.2 SATA to USB 3.0 and m-SATA to USB 3.0. Here’s some adapters I’ve used for those types of drives:
VL716 mSATA Enclosure
The VL716 mSATA enclosure lets you connect micro SATA drives to the Pi. These drives are an older type of SSD (usually seen in laptops) predating the M.2 slot but are still widely available and perform extremely well!
The UGREEN M+B enclosure is a great enclosure for the Pi for M.2 SATA 2280 NGFF drives. It supports both B-key and M-key drives. Does not support newer NVMe drives. As with other types of enclosures it requires more power than other options!
The Argon ONE M.2 is a M.2 SATA Pi 4 case / storage solution. With the case and M.2 SATA expansion board you can completely enclosure your Pi 4 and have a built in M.2 slot! The M.2 SATA board is sometimes sold separately from the case itself and can be used as well. Does not support NVMe, this is for SATA M.2 drives only!
Power can be a serious problem with these drives. We are learning from the comments that you are especially likely to run into power issues with NVMe enclosures. A powered USB hub or a power adapter that puts out 3.5A comes not only just strongly recommended, it may actually be required that you choose one option or the other for your drive to function.
The specific requirements of how much power you’ll need depend on the adapter/enclosure and the model of your drive itself. As a very rough guideline, older models of drives tend to use more power than newer models of drives. 3.5″ form factor drives also use more power than 2.5″ drives. The earliest SSD models like first and second generation models are also well understood to use significantly more power than newer models. This is due to changes and improvements in technology over the years and even using different more efficient memory like 3D NAND. Some super high end performance drives will consume more power as well.
Here’s the current recommendations based on everyone’s comments combined with stuff I’ve personally used with the Pi:
CanaKit 3.5A Power Adapter
The CanaKit 3.5A adapter has an extra half an amp (500 mA) of capacity to give some breathing room to your accessories. This is bigger than the official Pi power supply which provides 3.0A.
The Sabrent powered USB hub delivers a whopping 2.5A of dedicated power for your USB attached devices. This is almost as much as the Pi adapter itself is rated for (3.0A). It will easily power the most thirsty of setups such as NVMe enclosures.
Note: Make sure Amazon doesn’t try to take you to the non-powered version and that it’s the one with the AC adapter that plugs in to provide extra power
Fixing (some) USB Adapter Problems Using Quirks
Some of the very common adapters on the naughty list above (such as the Sabrent) can be made to work by using USB quirks to disable UAS mode on the drive. This lowers performance, but it’s still much faster than a SD card and your adapter won’t go to waste.
To find out the quirks we need to find the device ID string for your adapter and then add an entry to cmdline.txt telling the kernel to apply them on boot.
Find Your Adapter
To apply the quirks we first need to get the adapter id. We will use the sudo lsusb command:
$ sudo lsusb
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 174c:55aa ASMedia Technology Inc. Name: ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
On line 2 we can see my ASM1051E SATA 6Gb/s bridge adapter (it’s the known working StarTech.com 2.5″ SATA to USB adapter*). You will see something very similar to mine when you run the command and it shouldn’t be too hard to figure out which device it is. If you need more information add a -v switch to make the command sudo lsusb -v. This can sometimes add some additional details to make it easier to figure out which one is your adapter.
If you’re still not sure, we have another command that between the two that can narrow things down. Type / paste the following:
sudo dmesg | grep usb
[ 0.828535] usb usb3: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 4.19
[ 0.828568] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 0.828597] usb usb3: Product: DWC OTG Controller
[ 0.828620] usb usb3: Manufacturer: Linux 4.19.75-v7l+ dwc_otg_hcd
[ 0.828644] usb usb3: SerialNumber: fe980000.usb
[ 0.830051] usbcore: registered new interface driver uas
[ 0.830182] usbcore: registered new interface driver usb-storage
[ 0.836488] usbcore: registered new interface driver usbhid
[ 0.836511] usbhid: USB HID core driver
[ 0.971598] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[ 1.154217] usb 1-1: New USB device found, idVendor=2109, idProduct=3431, bcdDevice= 4.20
[ 1.154254] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 1.154281] usb 1-1: Product: USB2.0 Hub
[ 1.301989] usb 2-1: new SuperSpeed Gen 1 USB device number 2 using xhci_hcd
[ 1.332965] usb 2-1: New USB device found, idVendor=174c, idProduct=55aa, bcdDevice= 1.00
[ 1.332999] usb 2-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[ 1.333026] usb 2-1: Product: ASM105x
[ 1.333048] usb 2-1: Manufacturer: ASMT
[ 1.333071] usb 2-1: SerialNumber: 123456789B79F
This is the dmesg log showing the hardware detection as hardware is activated on the Pi. If your log is really long you can generate fresh entries by just unplugging a device and plugging it back in and running the command again. Here we can clearly see that the ASM105x is what our StarTech adapter is being detected as.
Now we can go back to our first lsusb command and we want the 8 characters from the ID field that comes right after the Device:
Bus 002 Device 002: ID 174c:55aa ASMedia Technology Inc. Name: ASM1051E SATA 6Gb/s bridge
Our adapter’s ID is: 174c:55aa
Applying Quirks
To apply the quirks to our USB adapter we are going to edit /boot/cmdline.txt. Type:
sudo nano /boot/cmdline.txt
We are going to add the following entry into the very front of cmdline.txt:
usb-storage.quirks=XXXX:XXXX:u
In place of the X’s above you will put in your adapter’s ID that we got before. With the example commands I gave above mine would look like this: usb-storage.quirks=174c:55aa:u. After this my cmdline.txt looks like this (everything should be one continuous line, no line breaks!):
Now reboot the Pi. If the Pi fails to boot you can plug the SD card into the computer and go to /boot/cmdline.txt and undo the change we did so you can boot back in with your SD card.
Verifying Quirks
Once you have rebooted after changing cmdline.txt we can verify the quirks have been applied by doing another dmesg | grep usb command:
sudo dmesg | grep usb
[ 1.332924] usb 2-1: New USB device found, idVendor=174c, idProduct=55aa, bcdDevice= 1.00
[ 1.332957] usb 2-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[ 1.332983] usb 2-1: Product: ASM105x
[ 1.333006] usb 2-1: Manufacturer: ASMT
[ 1.333028] usb 2-1: SerialNumber: 123456789B79F
[ 1.335967] usb 2-1: UAS is blacklisted for this device, using usb-storage instead
[ 1.336071] usb 2-1: UAS is blacklisted for this device, using usb-storage instead
[ 1.336103] usb-storage 2-1:1.0: USB Mass Storage device detected
[ 1.336479] usb-storage 2-1:1.0: Quirks match for vid 174c pid 55aa: c00000
[ 1.336611] scsi host0: usb-storage 2-1:1.0
This time we can see in dmesg that UAS was blacklisted for the device and it has loaded with the usb-storage driver instead. This driver tends to be more compatible with the “problematic adapters” but the performance is usually significantly lower. It’s definitely worth a try though as some adapters do better with the quirks performance-wise. The only way to know for sure is to run a benchmark (see storage benchmark section near the end).
USB Boot Instructions
There are a lot of steps to follow to set everything up properly. If you make a mistake the first time don’t spend too much time trying to correct it or figure out what you did wrong. It’s usually faster to burn the images again and reconfigure again rather than try to figure out which step you might have made a typo on. It’s much easier the second time!
Note: Don’t attempt to use raw dd commands to write the images. Too many silly things can go wrong that are checked for/fixed by the recommended programs. Do yourself a big favor and use one of the recommends to avoid spending a ton of time troubleshooting basic imaging problems!
Preparing SSD
We are going to burn a second identical copy of Raspbian to the SSD. This ensures everything the Pi needs to boot is there so we can use the SD card as a bootloader but our actual system will be on our nice fast SSD drive.
Note: Make sure you create the empty file named “ssh” on the boot partition of both drives if you are headless or don’t have a mouse/keyboard attached so you can ssh in on the first boot.
First Boot (SD card only, SSD unplugged)
Insert your freshly imaged SD card into the Pi and connect the power. Sign into the Pi for the first time.
Don’t do an apt-get upgrade/dist-upgrade or any additional configuration yet. Just stick with the instructions until we have finished configuration (especially since if something goes wrong you may have to start over and any other setup you did will be lost).
Once the Pi has finished booting and you have signed in for the first time plug in your SSD to your Pi’s USB 3.0 ports. The USB 3.0 ports are the ones that have the blue plastic inside instead of the black plastic (the black ones are USB 2.0 ports).
Change PARTUUID
We need to change the PARTUUID of our SSD’s partitions so the Pi doesn’t get confused about what device to boot from. Right now the partitions on both the SD card and the SSD are an exact match and we need them to be different so we can tell the Pi to boot specifically from our SSD’s partition.
We are going to use fdisk to change the SSD’s PARTUUID to the hexadecimal d34db33f to make our SSD easy to identify. Use the following:
$ sudo fdisk /dev/sda
Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/sda: 238.5 GiB, 256060514304 bytes, 500118192 sectors
Disk model: ASM105x
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x6c586e13
Device Boot Start End Sectors Size Id Type
/dev/sda1 8192 532479 524288 256M c W95 FAT32 (LBA)
/dev/sda2 532480 500118191 499585712 238.2G 83 Linux
Command (m for help): x
Expert command (m for help): i
Enter the new disk identifier: 0xd34db33f
Disk identifier changed from 0x6c586e13 to 0xd34db33f.
Expert command (m for help): r
Command (m for help): w
The partition table has been altered.
Syncing disks.
Your /dev/mmcblk0 and /dev/sda devices should now be different from each other. The SD card’s ID is 6c586e13 and the SSD’s PARTUUID is now
Update /boot/cmdline.txt
We are going to change cmdline.txt to point to the SSD for booting instead of the SD card. First make a backup of your existing cmdline.txt file with the following command:
sudo cp /boot/cmdline.txt /boot/cmdline.txt.bak
We’ve now created a backup you can restore if something goes wrong. If you need to restore your backup plug the SD card into a computer/device and replace cmdline.txt with cmdline.txt.bak that we made above. Now your Pi should boot normally again.
Open up /boot/cmdline.txt using nano or your favorite text editor:
Make the change and double check the line is what it should be,then press Ctrl+X to save our changes.
Note: cmdline.txt should be one long solid line with no breaks — don’t add any line breaks or the system won’t boot and you’ll need to restore the backup we made earlier!
Test SSD
We are now ready to test booting from the SSD. Restart your Pi by issuing a
sudo reboot
The first boot with your SSD can be slow due to running fsck on the drive. If you have a really large SSD it can take surprisingly long to check all that space. Once the check completes it will mark the drive clean and skip the disk check from now on. It can take over a minute or two sometimes for really big drives so give it at least that much time before assuming it didn’t work.
After signing in we can verify that the SSD is being used like this:
$ findmnt -n -o SOURCE /
/dev/sda2
Verify that partition has switched over as shown below to /dev/sda2 (SSD) instead of /dev/mmcblk0p2 (SD card).
Update /etc/fstab
We are now ready to edit the /etc/fstab file to point to our updated drive. To edit the file type:
We want to change the root ( / ) partition (PARTUUID ending with -02) to load our SSD’s PARTUUID instead of the SD card. Replace the 2nd partition’s PARTUUID field on the last line in the file with the d34db33f label we applied earlier with fdisk. After making the change my /etc/fstab file looks like this:
Press Ctrl+X to tell nano to save our changes. Now type sudo reboot to restart the Pi.
Note: We want to leave the first partition (/boot) on the SD card. If you change this to the SSD then apt will update your SSD instead of the SD card so they won’t be used during boot! Remember that we are using the SD card as a bootloader and that is why the firmware updates (such as start.elf, etc) should go there instead of the SSD’s boot partition (which is never used).
Resizing Filesystem
By default the partition on the SSD / Flash drive will only be 1.8G. The Pi expands this automatically on micro SD drives but we will need to do it ourselves for a SSD / Flash drive. To do this we need to expand the partition and then resize the file system.
First let’s open fdisk and print the partitions:
pi@raspberrypi:~ $ sudo fdisk /dev/sda
Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/sda: 238.5 GiB, 256060514304 bytes, 500118192 sectors
Disk model: ASM105x
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xd34db33f
Device Boot Start End Sectors Size Id Type
/dev/sda1 8192 532479 524288 256M c W95 FAT32 (LBA)
/dev/sda2 532480 4390911 3858432 1.9G 83 Linux
There is the line we need. Our start value for /dev/sda2 (rootfs) is 532480. Next we need to remove and recreate the partition as a larger size.
If you make any mistakes during this command just close fdisk by pressing q. The changes won’t be written to disk. If you mess up any of the commands the drive will no longer boot and you’ll have to start over again so be careful!
Command (m for help): d
Partition number (1,2, default 2): 2
Partition 2 has been deleted.
Command (m for help): n
Partition type
p primary (1 primary, 0 extended, 3 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (2-4, default 2): 2
First sector (2048-500118191, default 2048): 532480
Last sector, +/-sectors or +/-size{K,M,G,T,P} (532480-500118191, default 500118191): 500118191
Created a new partition 2 of type 'Linux' and of size 238.2 GiB.
Partition #2 contains a ext4 signature.
Do you want to remove the signature? [Y]es/[N]o: N
Command (m for help): w
The partition table has been altered.
Syncing disks.
If everything went well then type “w” and press enter. Otherwise press “q” to quit and try again. Once you enter “w” the changes will be permanently written to disk!
Now reboot the system. Type “df -h” to view the current disk:
We can see our disk is still 1.8G even after resizing the partition. That’s because we still have one more step! We need to resize the filesystem to fill our new partition space. For this we will use “sudo resize2fs /dev/sda2”:
sudo resize2fs /dev/sda2
resize2fs 1.44.5 (15-Dec-2018)
Filesystem at /dev/sda2 is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 15
The filesystem on /dev/sda2 is now 62448214 (4k) blocks long.
And that’s it! You will now be using all of your space on your drive.
Verify SSD Functionality / Performance
You can make sure everything is running correctly (and as fast as it should be) by running my quick storage benchmark. You can run the benchmark with the following one-liner:
This will give you a score you can compare to the other Raspberry Pi Storage Benchmark results and make sure that you are getting an equivalent speed to your peers with the same device!
Update Pi using apt
Now that we’ve updated fstab it is safe (and highly recommended) to update your Pi’s software. Type “sudo apt-get update && sudo apt-get dist-upgrade” to update the system and firmware.
Your system will now be running completely from your USB drive! To verify this, run the command “findmnt -n -o SOURCE” / to ensure your root partition has switched over as shown below to /dev/sda2 instead of /dev/mmcblk0p2.
Conclusion
The Samsung 950 Pro NVMe drive in the featured picture scored a 9189 on the Raspberry Pi Storage Benchmark. The previous all-time record score on a Pi 3B+ was 3561. The performance gains are very real and very dramatic.
For me getting this performance is well worth having to waste a micro SD card just to be a bootloader. I am largely after the USB 3.0 bus and gigabit ethernet performance improvements and using this method I am able to achieve the performance I was after without waiting an indeterminate amount of time for the feature to be added back in!
Although there are ongoing compatibility issues and we lack the super easy native USB booting support we had before I’m more than willing to go through the growing pains to finally get rid that ancient USB 2.0 bus! Just make sure if you are planning to build a system you plan your adapters and parts accordingly.
1,026 thoughts on “Raspberry Pi 4 USB Boot Config Guide for SSD / Flash Drives”
Nia
Hello all!
So I have been following this guide to boot my Pi4 from SD and have my rootfs on my SSD, this is my set-up:
* SSD: WD 250GB 2,5" BLUE SSD BULK WDS250G2B0A
* enclosure: Renkforce RF-4038897 mSATA USB 3.0
Somehow every time I try to reboot my Pi at step #7 , I cant access it anymore. I tried several times, I made sure the SSH file is there too for headless boot. Also changed the PARTUUIDs so they are not the same anymore.
I changed the cmdline.txt accordingly and also put rootdelay=5 (found that on another guide and thought it might help after it didnt work before) and it is still not working:
I cant access with SSH and I am really clueless by now what could cause the problem. Generally I am new to working with the Pi, so maybe there is something I did not think of yet. Basically I am stuck at step #7 of the guide. Any ideas? Thank you!
This comment is probably a little late to help you but I wanted to leave it anyways in case it helps others.
If you are struggling with the SSH access absolutely take the time to plug in *both* devices to your computer and recreate the ssh file. It tends to get “consumed” when you are going through this process and when the devices are switching back and forth it may not necessarily apply. Put both the SD card and SSD in and double check that both have a ssh file (and that it didn’t get eaten in a previous step).
I also updated the instructions quite a bit to hopefully help reduce headaches related to those steps.
Thanks for your reply, I started from scratch and I made sure to have the ssh file present on both drives – also after the first access via ssh.
But it still wont let me access it, it also didnt boot, only the red led is lighting up. So I still dont have any clue what the problem might be. Will update if I find a solution.
And thank you for the update on the instructions, those were quite useful!
If the SD-cards PARTUUID is the same as HDs or SSDs one, there is a script to alter the SD-cards PARTUUIDs. Be careful, the script changes your cmdline.txt on the SD-card, too. It will write …rootfs=/dev/mmcblk0p1… in there, but you can procede like in this article here descriped without any trouble. Thanks for guiding trough!
I run my Pi4B with the / partition on a Crucial BX500 SSD in a UGREEN USB3 enclosure. It works without a problem, except it doesn’t support fstrim. The only way I could perform TRIM on that SSD was using an about 10 year old script that I found and with the drive connected to my Linux Mint 19.2 laptop.
As that is not really a practical way of trimming and SSD, I bought some Inateck FE2010 enclosures which I had read worked with Linux and will let FSTRIM do its work. It is said to have a JMS578 controller.
In short: with the abovementioned SSD in the new Inateck case connected to a Pi4B’s USB3 port, booting was nearly impossible. One time I was patient enough to let it struggle for almost 30 minutes and eventually it brought up the Raspbian desktop. It took 60 times longer than with the SSD in the UGREEN case, totally unworkable.
I have not too many ideas about what to do then to try and solve this, if at all possible, so I shut the PI4B down and moved the SSD to the old UGREEN case. It still worked perfectly as far as I can tell. At on estage I ran a check of the file system. All OK.
With the Inateck case and the SSD in it connected to my Linux laptop, I was able to run FSTRIM on it. Also otherwise it behaved normally.
At the moment I don’t have another SSD to try in this Inateck FE2010 case, but if I connect it to the PI4B in addition to the UGREEN case with the SSD, and then boot, the Pi4B refuses to start.
If I boot the RPi4B with just the UGREEN case and SSD and then plug in the empty Inateck case later, I can see it appear in lsusb output.
LSUSB output from this case (with SSD in it) doesn’t state a vendor. HWINFO output is like this with nonsensical vendor and name info. Very annoying:
44: SCSI 400.0: 10600 Disk
[Created at block.245]
Unique ID: ofUZ.G_lTKP6Z8G9
Parent ID: MZfG.yHudtVzDTT6
SysFS ID: /class/block/sdd
SysFS BusID: 4:0:0:0
SysFS Device Link: /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1.1/2-1.1:1.0/host4/target4:0:0/4:0:0:0
Hardware Class: disk
Model: "TO Exter nal USB 3.0"
Vendor: "TO Exter"
Device: "nal USB 3.0"
Revision: "6402"
Driver: "uas", "sd"
Driver Modules: "uas"
Device File: /dev/sdd (/dev/sg3)
Device Files: /dev/sdd, /dev/disk/by-id/usb-TO_Exter_nal_USB_3.0_201503310009A-0:0, /dev/disk/by-path/pci-0000:00:14.0-usb-0:1.1:1.0-scsi-0:0:0:0
Device Number: block 8:48-8:63 (char 21:3)
Drive status: no medium
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #35 (USB Controller)
I have read about there being f/w updates for the JMS578 controller, but the info concerns odroid which I know nothing about.
I downloaded the update-package and ran the updater on my laptop to find out the f/w version, but even that didn’t work. At the moment I hava not been able to confirm there being a JMS578 controller in this Inateck case nor what version f/w it contains.
I wasn’t able to find any update support from the maker of the chip.
I could run an updater on Windows if that’s the only practical way. I made an FAT32 partition on the SSD just so Windows would see the drive.
(One day that may become the boot partition, which is now on the SD card)
In between I tried a Startech enclosure model S251BMU313 which was supposed to support trim. It didn’t and I returned it and was promised my money back. In a chat a Startech representative conformed there were ‘limitations’ in Linux which Startech blames for trim not working. Otherwise it ran as well as the UGREEN enclosure.
Elsewhere I read that it is Windows not adhering to ‘the standard’ and letting USB enclosure makers get away with half working products. I mean AFAIK TRIM is essential for SSD disks. There have been SSD disks on the market for many many years, even though I didn’t use any before, so how are these situations even possible these days?
Did you try the usb-storage quirks? I don’t see any mention of them and they may help here. I recently expanded this article and wrote a section on how to apply the quirks worth checking out.
Read-Write speeds seem a bit lower than I expected. Connected directly to my MacBook Pro, I get ~880MBps read, just over 900 write no problems, but connected to the Pi, I’m only getting low 300s in the benchmark for this site.
At first I thought maybe Raspian wasn’t supporting UASP, but after a little digging, it seems it is.
I’m sure I saw someone somewhere riding 600MBps through the Pi 4’s USB 3 port before I ordered the enclosure, but now I have no idea where I saw that.
Am I dreaming, or are there optimisations I could apply that might bump the performance?
Have you tried applying any of the USB quirk settings yet for your adapter? Lots of people here have reported it made a big difference for them on performance!
I didn’t think it was likely to help, as I wasn’t getting any of the errors in dmesg that the RPF said to look for before applying USB-Storage Quirks, but I gave it a shot
Benchmark before turning on quirks: 6396
Benchmark after turning on quirks: 4413
So that doesn’t seem to be it… any other ideas, anyone? 😊
Oh, and I found where I saw someone getting such high speeds, thanks to you sending me after the USB quirks, it’s on the second page of that forum thread
Adapter StarTech.com 2.5″ SATA to USB Cable: Bus 002 Device 002: ID 174c:55aa ASMedia Technology Inc. Name: ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge
# hdparm -I /dev/sda|grep TRIM
* Data Set Management TRIM supported (limit 8 blocks)
Root:
/dev/sda2 on / type ext4 (rw,noatime)
# fstrim -v /
fstrim: /: the discard operation is not supported
Sadly the Pi 4 has lots or problems with usb 3.0 and running my pi from the SSD makes it slower the DD test show it begin just as fast as the sdcard i used, but in real time use it is much slower.
This is a way better tutorial than i could find. Combined with the one from Toms harware i was able to get an already running raspberry pi 4 root system to be copied onto my ssd drive perfect.
Hello all!
So I have been following this guide to boot my Pi4 from SD and have my rootfs on my SSD, this is my set-up:
* SSD: WD 250GB 2,5" BLUE SSD BULK WDS250G2B0A* enclosure: Renkforce RF-4038897 mSATA USB 3.0
Somehow every time I try to reboot my Pi at step #7 , I cant access it anymore. I tried several times, I made sure the SSH file is there too for headless boot. Also changed the PARTUUIDs so they are not the same anymore.
I changed the cmdline.txt accordingly and also put rootdelay=5 (found that on another guide and thought it might help after it didnt work before) and it is still not working:
console=serial0,115200 console=tty1 root=PARTUUID=bd1d394e-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait rootdelay=5I cant access with SSH and I am really clueless by now what could cause the problem. Generally I am new to working with the Pi, so maybe there is something I did not think of yet. Basically I am stuck at step #7 of the guide. Any ideas? Thank you!
Hey Nia,
This comment is probably a little late to help you but I wanted to leave it anyways in case it helps others.
If you are struggling with the SSH access absolutely take the time to plug in *both* devices to your computer and recreate the ssh file. It tends to get “consumed” when you are going through this process and when the devices are switching back and forth it may not necessarily apply. Put both the SD card and SSD in and double check that both have a ssh file (and that it didn’t get eaten in a previous step).
I also updated the instructions quite a bit to hopefully help reduce headaches related to those steps.
Hey James!
Thanks for your reply, I started from scratch and I made sure to have the ssh file present on both drives – also after the first access via ssh.
But it still wont let me access it, it also didnt boot, only the red led is lighting up. So I still dont have any clue what the problem might be. Will update if I find a solution.
And thank you for the update on the instructions, those were quite useful!
Hi NIA,
Experienced same situation, figured it out on the fourth try.
Turns out I overlooked the guide, so here it is….
“Quote” ……We are going to burn a second identical copy of Raspbian to the SSD…… “End Quote”
So,
-Burn image to SD card
-Burn again image to SSD
Follow the rest of the guide….
If the SD-cards PARTUUID is the same as HDs or SSDs one, there is a script to alter the SD-cards PARTUUIDs. Be careful, the script changes your cmdline.txt on the SD-card, too. It will write …rootfs=/dev/mmcblk0p1… in there, but you can procede like in this article here descriped without any trouble. Thanks for guiding trough!
I run my Pi4B with the / partition on a Crucial BX500 SSD in a UGREEN USB3 enclosure. It works without a problem, except it doesn’t support fstrim. The only way I could perform TRIM on that SSD was using an about 10 year old script that I found and with the drive connected to my Linux Mint 19.2 laptop.
As that is not really a practical way of trimming and SSD, I bought some Inateck FE2010 enclosures which I had read worked with Linux and will let FSTRIM do its work. It is said to have a JMS578 controller.
In short: with the abovementioned SSD in the new Inateck case connected to a Pi4B’s USB3 port, booting was nearly impossible. One time I was patient enough to let it struggle for almost 30 minutes and eventually it brought up the Raspbian desktop. It took 60 times longer than with the SSD in the UGREEN case, totally unworkable.
I have not too many ideas about what to do then to try and solve this, if at all possible, so I shut the PI4B down and moved the SSD to the old UGREEN case. It still worked perfectly as far as I can tell. At on estage I ran a check of the file system. All OK.
With the Inateck case and the SSD in it connected to my Linux laptop, I was able to run FSTRIM on it. Also otherwise it behaved normally.
At the moment I don’t have another SSD to try in this Inateck FE2010 case, but if I connect it to the PI4B in addition to the UGREEN case with the SSD, and then boot, the Pi4B refuses to start.
If I boot the RPi4B with just the UGREEN case and SSD and then plug in the empty Inateck case later, I can see it appear in lsusb output.
LSUSB output from this case (with SSD in it) doesn’t state a vendor. HWINFO output is like this with nonsensical vendor and name info. Very annoying:
44: SCSI 400.0: 10600 Disk[Created at block.245]
Unique ID: ofUZ.G_lTKP6Z8G9
Parent ID: MZfG.yHudtVzDTT6
SysFS ID: /class/block/sdd
SysFS BusID: 4:0:0:0
SysFS Device Link: /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1.1/2-1.1:1.0/host4/target4:0:0/4:0:0:0
Hardware Class: disk
Model: "TO Exter nal USB 3.0"
Vendor: "TO Exter"
Device: "nal USB 3.0"
Revision: "6402"
Driver: "uas", "sd"
Driver Modules: "uas"
Device File: /dev/sdd (/dev/sg3)
Device Files: /dev/sdd, /dev/disk/by-id/usb-TO_Exter_nal_USB_3.0_201503310009A-0:0, /dev/disk/by-path/pci-0000:00:14.0-usb-0:1.1:1.0-scsi-0:0:0:0
Device Number: block 8:48-8:63 (char 21:3)
Drive status: no medium
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #35 (USB Controller)
I have read about there being f/w updates for the JMS578 controller, but the info concerns odroid which I know nothing about.
I downloaded the update-package and ran the updater on my laptop to find out the f/w version, but even that didn’t work. At the moment I hava not been able to confirm there being a JMS578 controller in this Inateck case nor what version f/w it contains.
I wasn’t able to find any update support from the maker of the chip.
I could run an updater on Windows if that’s the only practical way. I made an FAT32 partition on the SSD just so Windows would see the drive.
(One day that may become the boot partition, which is now on the SD card)
In between I tried a Startech enclosure model S251BMU313 which was supposed to support trim. It didn’t and I returned it and was promised my money back. In a chat a Startech representative conformed there were ‘limitations’ in Linux which Startech blames for trim not working. Otherwise it ran as well as the UGREEN enclosure.
Elsewhere I read that it is Windows not adhering to ‘the standard’ and letting USB enclosure makers get away with half working products. I mean AFAIK TRIM is essential for SSD disks. There have been SSD disks on the market for many many years, even though I didn’t use any before, so how are these situations even possible these days?
Did you try the usb-storage quirks? I don’t see any mention of them and they may help here. I recently expanded this article and wrote a section on how to apply the quirks worth checking out.
Working here, with a Orico NVMe M.2 enclosure, model TCM2-C3-BL, which runs the J-Micron JMS583 chipset, and a Crucial P1
Read-Write speeds seem a bit lower than I expected. Connected directly to my MacBook Pro, I get ~880MBps read, just over 900 write no problems, but connected to the Pi, I’m only getting low 300s in the benchmark for this site.
At first I thought maybe Raspian wasn’t supporting UASP, but after a little digging, it seems it is.
I’m sure I saw someone somewhere riding 600MBps through the Pi 4’s USB 3 port before I ordered the enclosure, but now I have no idea where I saw that.
Am I dreaming, or are there optimisations I could apply that might bump the performance?
Have you tried applying any of the USB quirk settings yet for your adapter? Lots of people here have reported it made a big difference for them on performance!
I didn’t think it was likely to help, as I wasn’t getting any of the errors in dmesg that the RPF said to look for before applying USB-Storage Quirks, but I gave it a shot
Benchmark before turning on quirks: 6396
Benchmark after turning on quirks: 4413
So that doesn’t seem to be it… any other ideas, anyone? 😊
Oh, and I found where I saw someone getting such high speeds, thanks to you sending me after the USB quirks, it’s on the second page of that forum thread
Hey guys,
is trim working for you?
Adapter StarTech.com 2.5″ SATA to USB Cable:
Bus 002 Device 002: ID 174c:55aa ASMedia Technology Inc. Name: ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge# hdparm -I /dev/sda|grep TRIM* Data Set Management TRIM supported (limit 8 blocks)
Root:
/dev/sda2 on / type ext4 (rw,noatime)
# fstrim -v /
fstrim: /: the discard operation is not supported
Sorry, I’m stupid, just found it…
# cat /etc/udev/rules.d/01-unmap.rulesACTION=="add|change", ATTRS{idVendor}=="174c", ATTRS{idProduct}=="55aa", SUBSYSTEM=="scsi_disk", ATTR{provisioning_mode}="unmap"
Sadly the Pi 4 has lots or problems with usb 3.0 and running my pi from the SSD makes it slower the DD test show it begin just as fast as the sdcard i used, but in real time use it is much slower.
This is a way better tutorial than i could find. Combined with the one from Toms harware i was able to get an already running raspberry pi 4 root system to be copied onto my ssd drive perfect.
Thanks Jens, glad it helped!