ANSI INCITS 467

Abstract

This standard defines the command set extensions to facilitate operation of the sequential-access device type. This standard, implemented in conjunction with the requirements of the SCSI Architecture Model - 4 standard and the applicable clauses of the SCSI Primary Commands - 4 standard, fully specify the standard command set for the sequential-access device type. <br>The objectives of this standard are to provide the following: <br>a) permit an application client to communicate over a SCSI service delivery subsystem, with a logical unit that declares itself to be a sequential-access device in the PERIPHERAL DEVICE TYPE field of the standard INQUIRY data (see SPC-4); <br>b) define commands unique to the sequential-access device type; and <br>c) define commands to manage the operation of the sequential-access device type. <br>The roadmap in figure 1 is intended to show the general applicability of the documents to one another. The figure is not intended to imply a relationship such as a hierarchy, protocol stack, or system architecture. It specifies the applicability of a standard to the implementation of a given SCSI protocol. <br>This standard makes obsolete the following concepts from previous versions of this standard: <br>a) the GAP SIZE field; <br>b) RSMK and setmarks; and <br>c) Attached Media Changer model. <br>The term SCSI is used to refer to the family of standards described in this clause.