Epson EL 486UC - Manual (Page 39)

To insert a diskette into a 5.25-inch drive, hold the diskette with
the label facing up and the read/write slot leading into the
drive.
When you want to remove the diskette, make sure the drive
light is off; then press the release button or turn the latch.
Remove the diskette and store it properly.
Never remove a diskette or reset or turn off the computer
while a diskette drive light is on. You could lose data, Also,
remove all diskettes before you turn off the computer.
Stopping a Command or Program
You may sometimes need to stop a command or program while
it is running. If you have entered a DOS or application program
command that you want to stop, try one of the following:
Press Pause
Hold down Ctrl and press C
Hold down Ctrl and press Break.
If these methods do not work, you may need to reset the
computer as described below. Do not turn off the computer to
exit a program or stop a command unless you have to, because
the computer erases any data you did not save.
2-2 Using Your Computer