Epson 386SX - Manual (Page 95)

You see a message on the screen that tells you the disk drive’s
read/write heads will remain locked until you reset the
computer or turn the power off and on again. The computer
locks the heads and disables the keyboard. You can now turn off
the computer and prepare to move it to the new location.
Turning Off the Computer
Before you turn off your computer, save your data, exit the
program you are using, and remove any diskettes from the
diskette drives. Turn off the computer first, then turn off the
monitor and any peripherals.
Using the Equity 386SX 3-25