ISO/IEC 14776-326:2015（E）定义了逻辑块设备的简化块命令集。本标准中描述的简化块命令以及所需的SPC-2命令及其限制，完全指定了RBC逻辑块设备的完整命令集。它为块设备提供了SCSI块命令（SBC）（ISO/IEC 14776-321）中的一组简化要求和选项。精简的命令集旨在更紧密地匹配简单块逻辑单元所需的功能。指定的命令对设备性能没有限制。该命令集最初的重点是启用连接到串行总线并利用SBP的硬磁盘和可移动媒体设备- 2（ISO/IEC 14776-232）用于命令和控制。第二版取消并取代了2002年出版的第一版，构成了一个小修订版。第二版提供了额外的解释，并更正了与第一版相关的错误。

ISO/IEC 14776-326:2015(E) defines a Reduced Block Command set for logical block devices. The Reduced Block Commands along with the required SPC-2 commands and their restrictions described in this standard, fully specify the complete command set for RBC logical block devices. It provides a command set of reduced requirements and options from SCSI Block Commands (SBC) (ISO/IEC 14776-321) for block devices. The reduced command set is intended to more closely match the functionality required for simple block logical units. The specified commands place no restrictions on device performance. The initial focus of this command set was to enable rigid disks and removable media devices attached to Serial Bus and utilizing SBP-2 (ISO/IEC 14776-232) for command and control. This second edition cancels and replaces the first edition published in 2002 and constitutes a minor revision. This second edition provides additional explanations and corrects mistakes with respect to the first edition.