The PowerBook computer has an internal hard disk drive with a storage capacity of 6, 12, or 18 GB. The drive uses the extended IDE (integrated drive electronics) interface, which is also referred to as the ATA interface.
The implementation of the ATA interface on this computer is a subset of the ATA/ATAPI-4 specification (ANSI NCITS 317-1998 AT Attachment - 4 with Packet Interface Extension). That specification is maintained by the National Committee on Information Technology Standards (NCITS) Technical Committee T13; more information is available on their website at
The software that supports the internal hard disk is the same as that in previous PowerBook models with internal IDE drives and includes DMA support. For the latest information about that software, see Technote #1098, ATA Device Software Guide Additions and Corrections, available on the world wide web at
http://developer.apple.com/technotes/tn/tn1098.html
The web page for Technote #1098 includes a link to a downloadable copy of ATA Device Software Guide .