Lenovo ThinkCentre A61 Hardware Maintenance Manual page 110

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Hardware Maintenance Manual
7. To install the new hard disk drive into the blue bracket, flex the bracket, and
align the pin 1 , pin 2 , pin 3 , and pin 4 on the bracket with the holes
in the hard disk drive. Do not touch the circuit board 5 on the bottom of the
hard disk drive.
8. Slide the new hard disk drive into the drive cage until it snaps into position.