SCSI命令集提供了操作系统对输入/输出设备（磁盘、磁带、打印机等）的高效对等操作。 本国际标准定义了独立介质转换器设备和集成到其他SCSI设备中的附加介质转换器功能的SCSI命令和模型。这包括设备服务器的命令和外部行为特征，以及附加的介质转换器命令(SMC)的行为。

The SCSI command set provides efficient peer-to-peer operation of input/output devices (disks, tapes, printers, etc.) by an operating system.
This International Standard defines the SCSI commands and model for indepedent medium changer devices and attached medium changer functions integrated into other SCSI devices. This includes the commands and external behavioural characteristics of a device server, and the behaviour of the attached medium changer commands (SMC).