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chiefwigms / picobrew_pico

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Raspberry Pi won't boot after power loss - Possible software corruption #309

Closed wiltdavi closed 2 years ago

wiltdavi commented 2 years ago

I recently had a short power lose and once power was restored my Raspberry Pi would not boot. I connected the device to a monitor and when I connected power it was just a black screen. Nothing showed up on the screen and all that was on was the red LED on the device. When putting the SD card in my PC I am able to view the files. On a new SD card I started over from the beta6 image and everything is back up and running.

Since the Raspberry Pi is not damaged and I am able to read the SD card, it appears something may be corrupted. I would like to recover some of my recipes and history that I don't have backed up.

Do you have any suggestions on how to fix the corruption or how I can recover the files? Looking at the SD card I do not see the file structure I am use to when using the samba.

chiefwigms commented 2 years ago

The reason you can't see the other files is because the root file system (RFS) is an ext4 partition (linux). When you plug your SD card into a Windows PC, you'll see the boot partition and another drive.

You could try to recover by doing this: https://forums.raspberrypi.com/viewtopic.php?t=128142

Essentially, setup another sd card, then get USB sd reader and use the pi to try and fix the old card. Or if you have a mac or another linux pc, you could try to run fsck on it from there.

You could also make a live boot cd with ubuntu/any flavor of linux and boot your PC to that and try to repair it that way too.

chiefwigms commented 2 years ago

Or if you are savvy, it looks like WSL2 on windows added ext4 support - didn't read too much to see if it supported pluggable drives, but its worth a shot: https://devblogs.microsoft.com/commandline/access-linux-filesystems-in-windows-and-wsl-2/

wiltdavi commented 2 years ago

Thanks for the explanation about the ext4 partition. I am still new to Linux. With a USB SD card reader connected to the Pi I was able to obtain all my files which were not backed up.

FYI, I looked into the WSL2 option but the mounting capability only appears to be available in Windows 11 so I was not able to try that method: https://docs.microsoft.com/en-us/windows/wsl/wsl2-mount-disk#limitations