Lenovo ThinkPad T61 Hardware Maintenance Manual page 66

Removing and replacing a FRU
When installing: Make sure that the hard disk drive connector is attached firmly.
When installing: The rubber rails on the hard disk drive must be attached to the
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MT 6463, 6464, 6465, 6466, 6467, 6478, and 6471
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replacement drive. Otherwise the drive cannot be installed
properly.
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