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Failed to resume from hibernate twice in a row

My PC spec

Recent relevant history that I can think of - based on its use in this forum, I downloaded CrystalDiskInfo, which said that my drive has 77 reallocated sectors, and was showing its status as 'Caution'. This happened in the last few months and I've been keeping an eye on it since. Reliability-wise my computer has been 100%. I figured that I would regularly back up my data and if the disk starts giving me actual problems or if the SMART readings dive-bomb, I'd do something about it.

I generally hibernate my computer (because the BIOS forgets to re-apply the undervolting setting on my CPU if I use sleep mode), I have done for probably more than two years, and I've never had any problems with it, until today.

When leaving for my morning appointment, I hibernated my computer. I switched it back on when I returned, and Windows said that it couldn't read the hibernation data and so would have to start Windows normally. After I booted Windows, I checked the SMART readings again, nothing had changed. I went to another appointment, hibernating it before leaving, then tried to resume it when I returned home, same problem again.

I checked the event logs, nothing scary in there except the obvious "guess what, Windows wasn't shut down correctly" type entries.

As I have my disk partitioned into two, with a minimal C drive (plenty of space left) for the OS (and that's where hiberfil.sys lives), I ran a full disk check on C drive (chkdsk /f /v /r). It didn't find anything wrong, it even said "no problems were found".

I then hibernated the machine straight away, and it worked fine. I'll try it again now for the sake of being thorough. I suppose I ought to have tried hibernating it a few more times before the disk check, but to be frank I'm suspecting the disk. I've seen chkdsk say "no problems found" before on other machines yet consistent problems "miraculously" disappear directly after the disk check. I kept half an eye on it during the check and I didn't notice anything untoward then either.

Nothing has changed on my machine recently (apart from the standard regular Windows updates), and my machine hasn't exhibited any odd/unusual behaviour lately (or even not so recently).

Any suggestions would be much appreciated.

- edit - resumed fine second time in a row.
 
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It's rare that a hard drive with bad sectors will do anything but get worse. I would get a new drive while you are still able to clone from your current drive.
 
'because the BIOS forgets to re-apply the undervolting setting on my CPU if I use sleep mode'

Chances are your undervolt is not stable enough to write the hibernation data to disk.
 
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