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It'd be worth backing up what you can and then running a full HDD test on the suspect drive using software provided by the manufacturer. You can either take the drive out of the PC or revert its HDDs back to IDE via the BIOS settings. As there'll be a DOS version of the HDD utility software that you can boot from a bootable USB pendrive with, you'll be able to take it from there. Let us know how testing the drive(s) goes. Usually such software will automatically mark any dodgy blocks in a way that the drive won't attempt to use them anymore and thus reliability of the drive is restored.
Thanks Flying_Kiwi! I'll definitely give that a try with the manufacturer's software. With an intermittent problem, I have no way of knowing if that's the correct answer, so I've flagged it as "helpful" so far.
As a side note, I received a notification of a private message, but by the time I reset my password and was able to log in again the private message appeared to have vanished. If you are reading this and wondering why I haven't responded to your private message, it's because I was never given the opportunity to read it. Sorry!
Thanks Flying_Kiwi! I'll definitely give that a try with the manufacturer's software.
Let us know how you get on. Manufacturers software is often very fussy when it comes to diagnosing problems so even though an error code may be generated on test, (if the drive is out of warranty) you MAY find that a low level format AKA zero fill resolves the issue for now and allows you to reinstall and get much more life out of the drive. Of course if the drive is still in warranty, you should contact the supplier or manufacturer.
As long as you regularly back up your data, you should be OK. What does SMART say about the drive and are both drives in the array identical (with the same firmware)? If there are no SMART warnings, that's always a good sign!
PS I've not sent you any PMs.