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C141-E167 GL-1
Glossary
Axial acceleration
Acceleration in the recording layer along the line perpendicular to the disk
reference surface at a specified rotation speed. Axial acceleration is detected by
optical means.
Bus Condition
This is an asynchronous condition for changing the status transition on the SCSI
bus. There are two types, the ATTENTION condition and the RESET condition.
Bus Phase
This is the name given to the SCSI bus state. The SCSI bus is in one state or
another, the BUS FREE phase, the ARBITRATION phase, the SELECT phase,
the RESELECTION phase or the INFORMATION TRANSFER phase. In
addition, the INFORMATION TRANSFER phase is subdivided into the DATA
IN, DATA OUT, COMMAND, STATUS, MESSAGE AND MESSAGE OUT
phases in accordance with the type of information being transferred in the
INFORMATION TRANSFER phase.
CCS
Common Command Set
This is the standard form of SCSI logical specifications stipulated by the
operations subcommittee of the American National Standards Institute (ANSI)
which stipulates functions which a direct access device (magnetic disk, etc.)
should support.
CDB
Command Descriptor Block
A series of data which describes commands related to input/output operations,
sent from the initiator to the target.
Command
This is a command to a target to perform an input/output operation, and it is
described as the CDB.
Disconnect
This is processing which temporarily frees the connected state of the target with
the SCSI bus and the initiator at the point in the target's command processing
execution process when operations on the SCSI bus are not needed.