ThinkPad P50 User Manual page 140

7. Slide the new M.2 solid-state drive into the tray as shown by arrow
drive slightly backward until it is fitted into place
Note: Ensure that you follow the identification mark on the tray to insert the M.2 solid-state drive.
8. Reinstall the screw to secure the M.2 solid-state drive to the tray.
9. Slide the tray with the M.2 solid-state drive into place
install it into the slot on the left, and then reinstall the screw to secure the tray
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1 . Then move the M.2 solid-state
2
.
1 . If you install only one M.2 solid-state drive,
2
.