Nathan Bass posted an answer for this Western Digital Caviar SE16 WD2500KS 250 GB Hard Drive:
"the knocking sound means that the 'arm' on the inside of the harddrive is going out...."
Nathan Bass posted an answer for this EPO Technology (CR-856E) Internal 56x CD-ROM Drive:
"My best quess wouldbe that the drive went out and you just don't realize or want to admit..."
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