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Information technology — Small Computer System Interface-3 (SCSI-3) — Part 321: SCSI-3 Block Commands (SBC)
block devices.
It specifies the functional requirements for the SCSI-Block Command set (SBC). SBC permits
that SCSI block logical units, such as flexible disks, rigid disks, optical disks, etc. be attached
to computers, and it provides the definition for their use.
This standard defines a logical unit model for SCSI block logical units. Also defined are SCSI
commands that apply to SCSI block logical units.
The clause(s) of this standard pertaining to the SCSI block device class, implemented in
conjunction with the applicable clauses of ISO/IEC 14776-311, fully specify the standard
command set for SCSI block devices.
The objectives of this standard are the following:
a) permit an application client to communicate with a logical unit that declares itself to be a
direct-access device, write-once device and optical memory device in the device type field
of the INQUIRY command response data over an SCSI service delivery subsystem;
b) define commands unique to the type of SCSI block devices;
c) define commands to manage the operation of SCSI block devices;
d) define the differences between types of SCSI block devices.
Figure 1 ? SCSI StandardDetails ? General structure
Figure 1 shows the general structure of SCSI StandardDetails. The figure does not imply a
relationship such as a hierarchy, protocol stack, or system architecture. It indicates the
applicability of a standard to the implementation of a given transport.
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