What are the differences between SCSI-2 and SCSI-3?
SCSI-3 changes the complete SCSI document structure and is no longer one document but a collection of documents, each with its own revision number. Some of these documents are the SCSI Primary Command (SPC) set layer, SCSI Block Commands (SBC) for hard disk interface, SCSI Stream Commands (SSC) for tape drives, SCSI Controller Commands (SCC) for RAID arrays, Multimedia Commands (MMC) , Media Changer Commands (MCC) and the SCSI Enclosure Services (SES) commands.