I have for several weeks recently been plagued by BSOD's which randomly attributed the cause to different culprits. Early in the events the graphics driver was fingered and I spent good money on returning my costly graphics card under warranty for checking. It came back with a clean bill of health. Cutting many hours of frustrating searching which included buying new DDR3 RAM, I concluded eventually after reading chkdsk results that the presence of a growing number of hdd bad sectors was an indicator that a 500GB WD hdd may be failing even though it was barely one year old. Two weeks ago I bought and fitted a new 1TB hdd and the BSODs stopped! However, yesterday I ran my Acronis 2011 backup software and the backup of a partition on the new hdd stopped telling me that it had "Failed to read from sector '502,405,961' plus a load of other text I won't bore you with. So, I ran chkdsk and lo and behold there was a bad sector reported on my brand new hdd which two weeks ago when installed showed no bad sectors at all. Can anyone tell me why sectors go "bad" and what is known about causes of sectors becoming "bad". I do not want my cost of the earth new 1TB hdd to go the same way as the one it replaced and if there is anything I can do to protect it I want to know what that is please.