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The capacity of the internal hard disk drive has been increased from 3.2 to 6 GB. The drive uses the Ultra IDE (integrated drive electronics) interface, which is also referred to as the Ultra ATA interface. The implementation of the ATA interface on the iBook is a subset of the ATA/IDE specification, ANSI proposal X3T10/0948D, Revision 2K (ATA-2).
The software that supports the internal hard disk is the similar to that in previous Macintosh 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 .