IBM 704 - Manual (Page 32)

Expansion Bays
The following illustration shows the location of the expansion bays
in your server. For installation instructions and information on the
types of drives that you can install in these bays, see Chapter 4,
“Installing Options” on page 73.
Removable Media
Bays
Hot Swap Bays
Diskette Drive Bay
14 PC Server 704 User's Handbook