Information Technology Reference
In-Depth Information
6
SCSI Commands
SCSI commands originated as a protocol for devices that use the Small
Computer Systems Interface (SCSI) parallel interface. The commands pro-
vide a framework for obtaining information about a storage device, control-
ling the device's operation, and reading and writing blocks of data in the
storage media. Storage devices that use other hardware interfaces, including
USB, also use SCSI commands to perform these operations.
About the Commands
The SCSI commands cover a wide range of device types and functions.
Most devices need to support only a small number of the commands.
Specifications
As Chapter 3 explained, each command travels in a structure called the
command descriptor block (CDB), or command block for short. The first
byte of the CDB is the code that identifies the command. Several sources
provide specifications for commands used by mass-storage devices.
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