Apple Mac 5260/100 - Manual (Page 10)

Basics Intelligent Device Electronics (IDE) Hard Drive - 8
Intelligent Device Electronics (IDE)
Hard Drive
The internal hard drive uses Intelligent Device Electronics
(IDE) technology, commonly used in DOS-compatible
systems. The IDE hard drive functions the same as a typical
SCSI hard drive. You must replace IDE drives like-for-like.
The IDE drive does not affect SCSI ID selections or SCSI
termination schemes. Seven external SCSI devices may be
daisy-chained through the external SCSI port.