Epson Equity 286 PLUS User Manual page 160

Guide the tabs on the front of the subassembly over the
opening in the front of the computer so that the two small
tabs sit behind the opening and the large tab with the
curved lip sits over the front of the opening. If necessary,
press on the large tab until the subassembly snaps into place.
6. Locate the hard disk drive socket on the main system board
(in front of the socket that holds the diskette drive ribbon
cable). There is a notch on one side of the socket, as shown
below.
notch
Installing and Removing Disk Drives
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B-21