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You may receive this error message when attempting to install ArcView GIS from a CD-ROM on a Macintosh:
"This disk is unreadable by this Macintosh. Do you want to initialize the disk?"
The extensions used to communicate required information with the CD-ROM have been disabled. The ROM drive cannot determine the format of the installation CD.
The term 'Extensions' used in this document is the Macintosh equivalent to a 'device driver' on a PC.
Before you begin the ArcView Installer, disable virus-detection utilities and close any open applications. The ArcView GIS Installation Guide instructs the user to turn off all extensions. Doing this will disable the CD-ROM.