Made minor corrections.

Added information to emphasize what types of commands applications can and cannot send to storage devices.

Added information about endian issues. Changed title from "Working With SCSI Architecture Model Devices."

The chapter Accessing SCSI Parallel Devices was revised to use a new code sample (the SCSIOldAndNew project, available at http://developer.apple.com/samplecode/Sample_Code/Devices_and_Hardware.htm) that demonstrates how to use the APIs of both the deprecated SCSI family and the SCSI Architecture Model family to find and access devices.

Preliminary version of Working With SCSI Parallel and SCSI Architecture Model Devices. This document comprises two chapters from an earlier version of Accessing Hardware From Applications and includes additional information on how to choose the correct API to work with SCSI Parallel devices.