Onnto 2.5" SATA HDD Enclosure User Manual page 6

4) Remove the screw from the control board by loosening the plastic caps.
5) Gently slide the HDD into place.
6) Fasten the HDD to the base using a Phillips screwdriver and the (4)
screws included in the package.
7) Align the edges of the HDD platform with the integral rails and carefully
slide the assembled platform into the enclosure housing.
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