Epson Progression U12 - Manual (Page 122)

3. Position the drive above the drive bay, as shown below.
Make sure the power supply and drive sockets face the
front of the subassembly. Then lower the drive into the bay.
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4. Adjust the drive’s position so the four holes on the drive are
aligned with the corresponding holes in the drive bay. Then
secure the drive with the four screws that came with it.
5. Now connect the drive and power supply cables, as described
in the next section.
Installing and Removing Drives 4-19