So I hooked up a hard drive externally, did the thorough format, then entered command CHKDSK /R F: and it ran the scan and didn't even tell me anything about bad sectors. I expected to see "0 KB in bad sectors" but that line is just simply not there. I ran the scan again--same thing. What is going on here? Why isn't it showing "0 KB in bad sectors?"
I think chkdsk will check for lofical errors, not physical errors. NT versions can check for physical errors.
Go to the hard drive vendor's web site and download their product specific diagnostic program.
I have run CHKDSK scans many times on many different drives that are similar to this drive and it did tell me about the bad sectors on all the other drives. This is the first time, in fact, that CHKDSK has not told me anything about bad sectors.
Here is an example of what it's supposed to look like when it scans a drive: