Failing Drive? Can't tell

I have a Win2k Micron system here. One day, after turning it on, it never booted, just made a few clicks. I figured the hard drive was failing. Turned it back on and it could not find the OS to boot. It would boot from the CD, but I was not able to do an OS "REPAIR". So I switched the master/slave switches on the 2 internal hard drives, reinstalled the OS on the second drive and tried to "read" from the failed drive. Well, everything is there - everything - I moved the important stuff to the new C: drive. I installed PassMark DiskCheck and Belarc Advisor to check the health of the supposed failed drive - everything checks out ok - no failure; no imminent failure. I'm at a loss. Could it be that somehow the MBR was corrupted or something? Any ideas anyone? I'm thinking I can wipe this disk, reformat and keep using it, yes?
Thanks for any insight.

Hi,
Yes it sounds like the master boot record has gone, you could of tried to repair it, but no need now as you have swapped drives.

I would download diagnostic software from the hdd maker, seagate, maxtor etc and run their own tests rather then generic third party ones.

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Yes, that sounds like a good idea. I wonder, what could have caused that? (assuming the drive isn't failing..) I've run 3 virus scans and found nothing. I'm just curious as to what the other causes could be.

Thanks!

9 times out of 10 is normally down to a drive problem! hopefully the diagnostics software will pick something up.

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