Epson EL 486UC - Manual (Page 81)

Removing the Mounting Fames
If there are mounting frames attached to your hard disk drive,
you need to remove them before you can install the drive.
Follow these steps:
1. On your drive, there may be a plastic guiderail and metal
grounding plate attached to one of the mounting frames. If
so, remove the screws securing them to the mounting
frame and remove the guiderail and grounding plate.
plastic guiderail
mounting frames
2. Then remove the two screws securing each mounting frame
to the drive and remove the frames.
Installing and Removing Drives 5-3