Lenovo ThinkCentre A58 Hardware Maintenance Manual page 118

To install or replace the secondary hard disk drive, do the following:
Figure 25. Removing the secondary hard disk drive
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Hardware Maintenance Manual
1. Remove the computer cover. See "Removing the computer cover" on page 90.
2. Locate the secondary hard disk drive. If you are installing a secondary hard
disk drive, go to step 7.
3. Disconnect the signal cable and the power cable from the rear of the hard disk
drive.
4. Press the blue release button to release the hard disk drive cage, and then lift
the hard disk drive cage out of the chassis.
5. Carefully pull on the blue handle to remove the hard disk drive from the
drive cage.
6. Flex the sides of the blue bracket properly to remove the hard disk drive from
the bracket.