Epson 486SX - Manual (Page 134)

Removing a Drive
Follow these steps to remove a drive from the external drive
bay:
1. Disconnect the power supply and drive cables from the back
of the drive you want to remove, as shown below.
2. Use the small wrench to remove the two nuts securing the
metal drive brackets to the front of the drive bay, as shown
below.
7-12 Installing and Removing Drives