Epson EQUITY 386/33 PLUS - Manual (Page 28)

If you have a 3½-inch diskette drive, insert the diskette with
the label facing up and the metal shutter leading into the drive,
as
shown
in the following illustration. Slide the diskette into
the
drive until it clicks into place.
When you want to remove the diskette, make sure the drive
light is off; then press the release button. When the diskette
pops out, remove it and store it properly.
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Using Your Computer