@paddy0174 Sorry for that. I posted because it worked for me. 
didnāt realise some things are not working for others. Beside some parts I found on the internet and used it.
For your last question: With this tut it works great on my RPi4! Rebooted many times because of adding new things in HA. No problems at allā¦
I initially migrated from an RPI 3B+ with SD card (32GB Sandisk Endurance) over to a Crucial BX500 120GB SSD but didnāt notice any performance improvements. The biggest improvement was moving to a 4GB RPI 4B with the same 32GB Sandisk Endurance card, where I noticed 3 day history graphs (of room temps, humidity etc) were loading up at least 50% faster.
Iām waiting for the Raspberry Pi Foundation to implement official USB boot support on the 4B before I switch back to the SSD to get the full benefits of USB 3 as well.
Just to let everyone know.
Most of the USB to SATA cases use simple chips (ASTMedia usually) that run around 25 to 50MB/Sec.
The only USB 2.5" cases I know of that do run fact are the Zalman ZM-VE500 that use ARM chip. This one is expensive (around $70) but it runs 300MB/Sec or so. I did not check the lower models.
I use these and only these USB SATA cases. I have tens of them and all are OK for few years now.
My mSATA with the x850 didnāt work. So got a sata drive with a cheap usb cable and now Iāve finally switched everything. Even got a 3d printed case, but might go caseless cuz noticed the cpu temps got higher.
Hi,
what RPi du you have? As far as I know itās not possible to boot from USB on a RPi4. Correct me, if Iām wrong.
Take a look here:
Yep, Pi4 is only bootable from USB, if you leave a microSD in it. 
Well, I have a Raspberry pi 3.
I flashed a sd card with raspbian and added program_usb_boot_mode = 1 to the test file config.txt to boot from ssd.
but I have a problem, only sometimes it starts by ssd.
canāt always boot from ssd.
would appreciate help
Im using the suggested a3ssdā|--Kingston A400 120GB SSD (SA400S37)ā|--Startech USB3-SATA3 adapter (USB312SAT3CB)ā|--Yā|--Yā|--bootcode.binā|----|ā
And i am able to boot raspbian from my SSD just fine on my pi3, with an sd card with bootcode.bin on it.
However when I flash my hassos image, I just get nothing. Nothing on the IP address, and nothing on my monitor. Iāve waited for half an hour. Absolutely nothing.
Does anyone seems to know what I am doing wrong?
Check my post above: HASS.IO -> transfer from SD card to SSD or USB
I ended up purchasing a new SSD for 25ā¬ and Iām now a happy camper running off an SSD 
@jelle2503, Iām not 100% sure what might be causing your problem, but that also happened to me the first time upgraded hassos when I converted to ssd. I think it was due to the new firmware that comes on new hassos installs. If your pi has older firmware (likely if you havenāt yet installed hassos >=3.4), the install process will involve a reboot after flashing firmware. Not sure, but I suspect that if you donāt have a newer firmware yet, the first flash to the new firmware may require an extra reboot or 2 before it runs properly (perhaps the hassos install isnāt handling the initial firmware upgrade properly, or thereās something in that firmware that requires a power off afterwards to setup properly).
All I know is Iāve updated hassos several times since with zero issues. At least 2 of those recent updates also included updated pi firmware. So if you have troubles at first, sometimes persisting to install again, or rebooting the pi when it appears to become unresponsive during install, may complete the firmware install after which it will work fine.
Just a noteā¦ it doesnāt actually flash anything. The firmware is in the āimageā it does not write to flash on the RPi itself. If you boot the Pi with an old SD-Card hey presto you are back to old firmware again.
Thanks for the insight; excellent info to know. Iām used to the world of arduino with āreal firmwareā, softbricking, etcā¦ so this is new to me. So then it must have been some other random problem that went away after a couple tries.
Someone is working on an automated solution for all this soon, in the meantime Iāve documented the manual steps (tested on RPi 4) here: https://github.com/home-assistant/operating-system/issues/164#issuecomment-602145682
I note that there is still no Raspberry Pi 4 option for direct boot to SSD, and it doesnāt look imminent either. You have to use an SD+SSD configuration. Raspberry Pi 3 can direct boot to USB, no SD card required: https://github.com/home-assistant/operating-system/blob/2e7e0398996c5fb39e566e9d6d72df2975ac9f39/Documentation/boards/raspberrypi.md
The last command:
curl -sL "https://raw.githubusercontent.com/home-assistant/hassio-installer/master/hassio_install.sh" | bash -s--m raspberreypi3
returns:
bash: line 1: 404:: command not found.
If I go to the site, there are no files there. Can someone tell me what Iām doing wrong?
Thanks
Because you have the wrong link. You can find the correct link on the installation page.
The problem is, if the links get updated by home assistant, the tutorials mostly donāt get updated (understandable).
And you didnāt used the correct writing for raspberrypi. So in the end, it should be:
curl -sL "https://raw.githubusercontent.com/home-assistant/installer/master/installer.sh" | bash -s -- -m raspberrypi3
Holy crap. I even went to the installation page and thought I copyād and pasted correctlyā¦
Thank you - this worked!
Iām an idiot - this corona thing maybeā¦ dunno.
Many thabks @paddy0174
My pi4 arrived and I have hassos and my snapshot running well, except for mariadb, influxdb, and grafana, using the steps you posted on githubā¦ kind of. Initially my ancient lxle laptop failed at this. So I flashed an iso of mint linux with etcher to a usb stick, booted my win pc from that, and followed your directions (I think). I used gparted to first create a fat32 partition (aka mbr), formatted it ext4, and went on from there.
After getting it to reboot using the ssd several times, I loaded my snapshot, saw (as I expected from my research) db error logs. So I uninstalled, reinstalled, and reconfigured the 3 aforementioned db addons, and off it went. Now my ha is much faster, and has room to grow.
hi need some help hereā¦
iāve followed the steps aboveā¦
did the usb boot trick, was able to boot via ssd without sd-card. did all the upgrades and installs without any issues, however when i rebooted raspbian, ,my pi3b refused to boot back upā¦my SSD and pi3b jujst kept blinking the LED 
Without any errors or logs itās hard to sayā¦
Did you remove the SD-card before booting it up?
Iād try one of these:
If your SSD has a LED light, is it working, flashing, anything?