Lenovo ThinkStation P2 Tower Hardware Maintenance Manual page 66

Removal steps of the 3.5-inch primary storage drive and bracket
1. Remove the "Computer cover" on page 54.
2. Disconnect the signal cable and the power cable from the 3.5-inch primary storage drive.
3. Remove the 3.5-inch primary storage drive and bracket.
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P2 Tower Hardware Maintenance Manual