Lenovo ThinkCentre A55 8705 Hardware Replacement Manual page 27

7. To install the new hard disk drive into the blue bracket, flex the bracket and
align the pins 1 through 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.
Chapter 2. Replacing hardware
19