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I recently discovered that my RAM is faulty (MemTest86+). I am waiting for new RAM to be sent to me. It was through sheer luck that I discovered something was wrong. I was copying a large amount of big files and decided to verify the copies by their checksums. I discovered strange discrepancies, and noticed that checksum computation for the same file was not consistent. Now, this is the only problem I have encountered; no BSOD, no crashes, no errors. In a sense this makes me more worried than if I would have had massive crashes. I have no idea for how long the RAM has been faulty, and I have no idea if corrupt bits have been saved into files on my hard drives. I do know the RAM was fine two months ago (tested it back then). I am a user of Adobe's Lightroom and I am worried that photos or the catalog itself could carry corrupt data.
Question: what should I do once new healthy RAM has been installed? Reinstall Windows (I'm using Windows 7, 64 bit)? Is there a risk that I will be presented with nasty surprises in the future if I don't? What about personal files? I have backups of some of the files but for newer files I'm not sure I can even trust the backups. It's going to take me many hard hours to manually replace files with older versions, or compare checksums.
Thanks for the encouraging answer. I am not touching the computer until new RAM has arrived. I think, as you say, that I will carry on as normal. I will probably spend a bit of time doing tedious detective work with my personal files. Many of my newer photos are still on an SD card, so I do have the "originals". It will be a tough job to go through though. Questions: I assume that moving files don't involve rewriting, and a simple file copy has "built in" error checking, so I would imagine that a false positive (incorrectly written file reported correctly written) is small? – DustByte – 2012-12-13T23:25:42.950
Seems to me like faulty RAM could cause both the operating system as well as applications to mess-up files other than what you might expect, like the ones you explicitly edited. For example the OS could update the wrong sectors on the disk that weren't even part of the file it thought it was writing to. – martineau – 2012-12-14T00:30:00.157