Lenovo ThinkStation P340 Tiny Hardware Maintenance Manual page 76

Replacement procedure
1. Remove the computer cover. See "Computer cover" on page 62.
2. Remove the bottom cover. See "Bottom cover" on page 70.
3. Open the retention latch.
4. Remove the M.2 solid-state drive.
5. Install the M.2 solid-state drive.
6. Close the retention latch.
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P340 Tiny Hardware Maintenance Manual