Epson LT-286 - Manual (Page 78)

The hard disk switch is labeled HDD POWER and is located on the
back of the computer, next to the AC adapter socket:
Power
switch
You can turn off the hard disk either before you turn on the
computer or after:
l
If you do not plan to use the hard disk at all, turn it off before
you turn on the computer.
l
If you need to load MS-DOS or an application program or to
access files on the hard disk, leave the hard disk switch on
when you turn on the computer, then turn it off later as
described below.
4-18 Using the Equity LT-286