Epson 486SX - Manual (Page 136)

Installing or Removing a Drive in the Internal Bay
You can install only hard disk drives in your
computer’s internal drive bay. If you are installing your first
hard disk drive, install it in the position farthest from the power
supply.
power supply
If you are installing or removing a hard disk drive in the
position next to the power supply, first remove the front panel
and subassembly as described in Chapter 5.
The following procedures explain how to do these tasks:
Remove a drive
Install a drive
Connect the drive cables.
7-14 Installing and Removing Drives