Epson EQUITY 386SX/16 PLUS - Manual (Page 19)

Removing the Protector Card
If you have a diskette drive, there is a protector card
in the diskette slot. This card is inserted at the factory to
protect the read/write heads in the drive. To remove it, flip
the latch up to pop the card out part way, as shown below;
then pull it out.
(If you have a second 5 diskette drive, be sure to
remove the protector card from it.)
Save the protector card. If you transport your computer, you
may want to insert the card into your diskette drive prior to
shipping. This will protect the read/write heads during the
shipping process.
Setting Up Your System 1-3