this post was submitted on 01 Nov 2023
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It goes without saying but the number of errors you should get on a scrub is ideally 0. Bitrot happens from time to time which is why you should keep some data redundancy/backups so you can repair it when it's detected, but that number seems higher than normal. Your disk may be going bad if you're getting that many read errors; I'm not sure. I believe you're already backing up data off this drive but yeah I would get everything important off the drive ASAP, then run a SMART short test and a SMART long test to see if that reports that anything is wrong. The disk may be fine but better to be safe than sorry.
Back to the video file, I'm assuming it was not one of the ones that BTRFS fixed automatically? The only real options for data recovery are to rescue the file minus the bad blocks with e.g.
ddrescue(which I don't personally have familiarity with) or something similar, or to encode through the errors with ffmpeg if it will let you.A SMART Test showed 6 bad sectors but overall disk assessment was ok(I dont think there is any connection between the file and the HDD), yes that file has not been fixed, the disk in question used to be my main bootdrive a few days ago, I shrunk the partition and created a new EXt4 and i am slowly copying files that are worth keeping, i removed the ODD from my laptop and installed a caddy, intend to use it as a second drive(The file in question has no sentimental value)
Okay cool. I would be wary of that drive just in case, and I would definitely schedule weekly SMART short tests and monthly BTRFS scrubs on it if you go with BTRFS in the future. EXT4/XFS/etc do not have a concept of data checksums, which means they can't scrub and check for bitrot - this might be problematic if you find that your disk starts causing bitrot because you won't know where it's happening.
I follow Backblaze's rules on detecting impending drive failure:
If any of these SMART metrics are higher than 0 I'd expect failure soon and take precautions.
Thank you Id 197 and 198 reported 5 & 6 respectively(bad sectors decreased from 6 to 5), Is it possible to copy a file non sequentially; say back to front so i can just join those 2 parts together?
Try this answer. I guarantee there is a way to read the file front to back while skipping errors, but I run so much data redundancy that I don't have any experience with it.
Thank you