I was recently facing a problem of windows always prompting to check for bad sectors for my D drive, which is , the 320 GB Hard drive of Western Digital. I tried quick formatting but it didn't prevent from computer getting slow down at start up . I tried running WD Lifeguard diagnostics and quick test failed on it with Error- 07, could not perform quick test. Extended test showed bad sectors and when i tried repairing them , it said it couldn't repair my hard drive. And error code was- 08. Can anyone help me knowing what should i do to check if my hard disk is repairable or not ?