Hi; I recently encountered a service technician telling me and my friend that his hdd bad sectors may have been caused by the OS itself. Is that true? How can that be? I never heard of that before... I heard some programs/software causing bad sectors but not the OS. Before our encounter with the said service technician, we did a checkdisk/F but the bad sectors were not corrected by Windows. We used the manufacturer's hdd diagnostic/repair software. It did confirmed the presence of bad sectors and gave an option to repair it. After using it(repair function) the hdd software said it had successfully repaired the bad sectors. But after we exited and checked via checkdisk...the bad sectors were still there . Same number as it was first detected. We ran the manufacturer's hdd diagnostic/repair software again but it said there was no bad sectors. When we did a checkdisk, the bad sectors were there. Used Auslogics Disk Defrag function of "Check for Errors" and it detected it with bad sectors(same number as it was first detected). Even used Auslogics' option to "Correct" the errors but it also cannot repair the bad sectors. Well, the hdd was placed under RMA and will be replaced this week. But some inquiries again: 1) Is it really possible that the OS have caused the bad sectors? If so how? ( can you give some inputs on this please...) 2) What is more reliable..the manufacturer's diagnostic tool or Windows? 3) Any effective 3rd party software out there that can "effectively-reliably" diagnose/repair bad sectors? 4) Can you share some approaches/inputs as to what you have to do: a) when you encounter bad sectors b) when the bad sectors cannot be repaired..(well, replacement (RMA) is best I believe but maybe some more ideas are around.. ..) Very eagerly waiting for your gracious responses here! Thanks !