So I pulled this hard drive out of a unit that was un-formated on of no where and re-formated it just fine in windows. Decided to run some test on it and got these errors.
Errors
Reallocated Sector Count
Reallocated Event Count
Current Pending Sector
Ran a Disk Check: with no errors...
Can these errors be fixed? I've formated the drive 3 times now, and each time it was successful. I can copy stuff to the drive just fine.
Answer
A HDD only detects faulty sectors when it tries to read from it but fails. Then it adds the sector to the pending sector count. Which will reallocate it to somewhere else as soon as you try to write to this sector the next time. (reallocated sector count)
Why did the read fail? Either the writing failed (and was not noticed since HDDs just write and assume it was successful) or the reading simply does not work for whatever reasons. The thing is, to be sure that your HDD is okay you need to write to every sector and then read every sector.
If after reading every sector the pending sector count has increased, you know that something is still broken.
I would suggest a tool like http://hddscan.com/
Use it to write and read every sector (preferably several times) to ensure your drive is okay (i.e., the yellow values do not change). Also the pending sector count should be zero.
Nevertheless you should probably backup and replace the drive. ,
After their first reallocation, drives are over 14 times more likely to fail within 60 days than drives without reallocation counts, making the critical threshold for this parameter also one.
Source: Failure Trends in a Large Disk Drive Population
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