Epson Apex 20020 - Manual (Page 65)

Slide the diskette into the slot until it is in all the way. Then
turn the drive latch down to lock it in a vertical position. This
keeps the diskette in place and enables the read/write heads in
the diskette drive to access the diskette,
If a diskette is in the drive but the latch is up (horizontal) and
you enter a command for that drive, the computer cannot tell
there is a diskette in the drive and displays an error message
such as:
Not ready error reading drive A
Abort, fail, retry?
Close the latch and press R.
To remove the diskette, turn the drive latch up until it is
horizontal and the edge of the diskette pops out. Carefully pull
out the diskette, place it in its protective envelope, and store it
in a proper location, such as a diskette container.
If you have an optional 3½-inch diskette drive, insert the
diskette with the label facing up and the metal shutter leading
into the drive, as shown below. Slide the diskette into the drive
until it clicks into place.
Using Your Computer 3-13