Lenovo ThinkCentre M90s Gen 2 Hardware Maintenance Manual page 75

1 M.2 solid-state drive Gen 4 slot (for M90s Gen 2)
2 M.2 solid-state drive Gen 3 slot
For access, remove the "Computer cover" on page 61.
Remove the M.2 solid-state drive Gen 4 and the heat sink (if any) depending on the computer model.
• For computers without the heat sink for the M.2 solid-state drive Gen 4:
• For computers with the heat sink for the M.2 solid-state drive Gen 4:
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Chapter 6 Hardware removal and installation
69