Does the hdd gets detected in BIOS and OS without issues?
Does it makes annoying click sounds or is always smooth?
Was it dropped or manhandled anytime during its lifetime?
If bad sectors are logical then not much of issues else have to throw the disk.
M a hdd repair specialist hence the queries. One of my friends intrested but not sure whether to go for or not as he will be depending on me for this purchase....
--Can you scan thr disk with some tool esp. Hd tune and post the bad sector pic. so we can come to know how badly its affected?
Also are you able to create any partitions and format them properly?