84    IBM Desktop System HMM
Identifying the Parts of the System Unit
This computer system has four bays that can hold 
5.25-inch and 3.5-inch drives.   Additional devices 
can be installed in the empty bays.
Diskette drives in this unit use the standard diskette 
advanced technology (AT) interface. Hard disk drives 
in this unit use an integrated drive electronics (IDE) 
AT interface. This computer supports the American 
National Standards Institute (ANSI) standard for AT 
attachment disk drives.
It also has interface slots for installation of additional 
cards devices. Industry Standard Architecture (ISA) 
and Peripheral Component Interconnect (PCI) 
adapter cards are both supported.
1.
Bay 1 and 2. 
These two drive bays can hold a 5.25-inch half 
high drive or a 5.25-inch slim drive. A 3.5-inch 
drive can be accommodated with additional 
brackets. This bay can hold a CD-ROM, DVD-
ROM, diskette, hard disk, tape, or Zip drive.
2.
Bay 3.
This drive bay can hold a 3.5-inch slim drive, such 
as a diskette, hard disk, tape, or Zip drive.
3.
Power Button.
4.
Bay 4. 
This drive bay can hold a 3.5-inch diskette drive, 
such as hard diskette drive.
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