What are you trying to test? Performance? Data integrity, i.e., does it still work?
What factors would determine "goodness" for the test that you desire?
If I have a flakey HDD, I usually just hook it up to a linux system and see if I can copy data to the entire disk using "dd". If that doesn't work, the drives goes off to RMA.
For testing performance, I sometimes use "hdparm" or "bonnie++" in Linux.
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