Epson EISA Desktop - Manual (Page 92)

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
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
drive in the internal bay.
6-2 Installing and Removing Drives