Lenovo ThinkStation P7 Manual page 45

7. Align the drive, upside down, so that the signal and power plugs are on the
end of the carrier as seen in the below image.
8. Line up the holes on the side of the drive with the posts on the inside of the
carrier and insert the posts into the holes.
9. Gently bend the open side of the carrier outward, until the posts on the
carrier can clear the side of the drive. Then insert the posts into the holes
on the side of the drive.
10. Align the tabs on the side of the drive carrier with the notches on the inside
of the tray and insert the tabs. Lower the carrier side with the red handle
down into the tray and press on the red handle until it clicks into place.
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