Epson 486SX - Manual (Page 124)

Using the Correct Drive Bay
Your system can hold up to five half-height drives or a
combination of third-, half-, and full-height drives. As shown
below, there are two drive bays: the external drive bay and the
internal drive bay.
subassembly
I
internal drive bay
external drive bay
The external bay can accommodate up to three drives in the
following configurations:
One third-height drive and two half-height drives
One third-height drive and one full-height drive.
You can install either two half-height drives or one full-height
hard disk drive in the internal bay.
If you are installing a hard disk, it is best to install it in the
internal bay. This reserves the more accessible external bay for
any drives you may want to add later. If you prefer, however,
you can install a hard disk in the external bay; just leave the
drive slot cover installed in the front panel.
7-2 Installing and Removing Drives