Lenovo IdeaCentre A300 - Manual (Page 34)

Hardware Maintenance Manual
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5. Remove the 3 screws that secure the hard disk drive to the base
bottom. 1 Disconnect the data and power cables from the hard disk
drive. 2 Pull out the hard disk drive.
2
1
6. Remove the 4 screws that secure the hard disk drive to the drive bay.
Slide the hard disk drive out of the drive bay.