this post was submitted on 11 Sep 2024
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Could this possibly result in the loss of data? If so, what's a simple way to do a backup of an entire disk?
fsck almost certainly isn’t going to cause loss of data, but it will likely inform you about a loss that already occurred if that is the issue you are having.
ddrescue is probably your best bet
dd is the simplest: dd if=/path/to/disk/device of=/path/to/backup/file but it may fail with a broken device. ddrescue is similar but handles io errors appropriately and can retry bad reads.
If the disk is failing anything you do that reads or writes it could cause data loss. Even having it plugged in and powered potentially could. It depends on what component of it is failing.
That being said, fsck is pretty safe. It's the equivalent of chkdsk in windows, it looks specifically at the filesystem for things that may have gotten screwy.
ddrescue/gddrescue is your best bet for recovery. It can detect bad blocks and skip them, and it has some p robust resuming capabilities if your disk locks up while.its running. I usually use it to clone entire physical disks to another disk or an image file that can be mounted. I don't know if it can be used to grab specific files, I've never tried.
If it was me, I'd take the disk out and let it cool to room temperature. Then I'd ddrescue the whole thing, with resume turned on, to an image file. Then I'd run fsck. If fsck finds and recovers filesystem issues, I'd put it back in the pi, continue using it, and start doing regular backups of important files via a cron task.
I managed to get it working. fscked the microsd and copied the files over to my pc. I'm going to be running MC on my pc until I get the Raspberry Pi M.2 HAT and an SSD
That's great, glad to hear it. Start doing backups too!
I shall, thanks