Lenovo C20–00 Hardware Maintenance Manual page 36

Step 5. Remove the 6 screws that secure the hard disk drive to the rear cover.
Step 6. Disconnect the data and power cable from the hard disk drive.
Step 7. Lift up the hard disk drive to remove it.
Step 8. Remove the 4 screws that secure the hard disk drive to the bracket.
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Lenovo C20–00 Non-Touch All-In-One PC Hardware Maintenance Manual