After I heard a grinding sound on boot up, my system no longer recognized my two slave hard drives. How do I know if my primary hard drive has lost sectors for my slave hard drives, or if one of my slave hard drives has gone bad?
by 
Elizabeth LaCava
ANSWERS: 1
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You can try booting to a recovery console using your windows disk or any generic recovery diskette and then doing a scan disk on each individual hard drives. I've come across this many times before when you do a deep-scan disk on the bad drive it should repeat the noise and/or indicate the hard drive is bad. You will have to do it on all the hard drives one at a time to determine which is shot. If your hard drive is making "Grinding" noises, its either factory defective or it sustained a physical trauma (If you dropped the hard drive, hit the computer, the desk or the surrounding area at the wrong time it can permanently destroy a drive). In either event this usually indicates the headers (The little nodes that come out to read the platters where the data is stored inside the hard drive) have crashed and are making actual contact with the platters causing physical damage to them. The drive in question is probably unrecoverable. P.S. if the scan-disk crashes mid-scan, the drive is dead.
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