IBM ThinkCentre 8105 Hardware Replacement Manual page 26

2. Pivot the drive bay assembly upward to gain access to the hard disk drive.
3. Disconnect the signal and power cables from the rear of the hard disk drive.
4. Lift the hard disk drive and bracket up to remove it from the hard drive bay.
5. Remove the failing hard disk drive from the blue bracket by flexing the bracket
enough to slide the drive out.
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Hardware Replacement Guide