Epson Equity 286 PLUS - Manual (Page 191)

Guide the tabs on the front of the subassembly over the
opening in the front of the computer so 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.
7. Locate the hard disk drive and diskette drive ribbon cables.
(The hard disk drive cable is slightly wider than the diskette
drive cable.) Check the back of the drives to make sure you
know which cable is which.
B-52 Installing
and Removing Disk Drives