Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 76

1. Insert a metal rod (approximately 1/16 inch in diameter and
at least 1 3/8 inches in length [1.2 mm × 35 mm]) into the
emergency eject hole, found in the center of the eject
button , and push firmly.
You may use a straightened paper clip to eject the diskette
manually.
2. Slowly pull out the diskette from the drive to remove it.
After manually removing a diskette, and before shipping
your computer, be sure to turn on power to the computer
to allow the diskette drive to reset the eject mechanism.
If you create a Windows 95 startup disk, use a 1.44-megabyte
diskette. A 120-megabyte diskette will not boot correctly.