If you access to any testing s/w. use it. if it reports again some error for that HD, then you have to replace it. Usually, a HD is h/w based error. If somehow s/w based, then that testing s/w should explain or point in that regard. Basically, if it at fault, replace HD. Sorry, there is no cheap way of this other than to prove it is faulty. If s/w based, maybe corrupted, re-install the OS or recovery s/w and see where that leads as a final resort. Of course, if you have some warranty, use it. For testing s/w, verify who made the HD and visit their support website and get that. If you have a HP PC, maybe the below will help. -OR- you can post at their support website for answers.
http://h30434.www3.hp.com/t5/Notebook-Hardware/BIOHD-7-disk-Failure/td-p/241355
BTW- Don't capitalize text, it's considered improper, tantamount to "shouting" your message.
tada -----Willy 