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Detect Which Files Are Corrupted on External Hard Drive

I have an external hard drive that I let a friend borrow. While he was transferring some files, he accidentally unplugged it. When he plugged it back in, I think many files said that they were corrupted or something. I'm not sure what he did to get the files working again but I just want to make sure that none of the file are corrupted. What's the best software that can I use besides the built in error scanning utility that can scan for errors and say which files are corrupt if there are any? Or should the built in error checker suffice? Thank you
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and235100
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Chkdsk is very powerful - but depending on the state of the files - it can make things worse.
I would look at running http://www.ontrackdatarecovery.com/file-recovery-software/ - EasyRecovery Professional - to recover the files.
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orangutang

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What would I choose when I install the free trial to find out what files are corrupted? I tried the advanced recovery but it seems like I hav to manually search through every folder to find out what files are corrupted. Thanks
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and235100
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Okay, thanks. Well, I'd first like to tell what files are corrupted, if any. If there are any, I might buy the software.
This tool might be of use:

http://marc.kupper.googlepages.com/scandf

Try it - it won't do any harm - just output possible corrupted files to a txt file.
It might be totally useless though... I haven't any corrupted files to try it out on...
Okay, I ran
chkdsk e: /v
and I don't think it found anything. Should I run chkdsk again and allow it fix any errors anyway?
Yes - /f will not usually cause further corruption - chkdsk /r is the one to watch out for...
Thank you. I'm just going to keep the hard drive as it is and use chkdsk sometime later.
If you can read the drive - there is no real risk for the time being.
Thank you.