In computer terminology, a Check Condition occurs when a
SCSI
Small Computer System Interface (SCSI, ) is a set of standards for physically connecting and transferring data between computers and peripheral devices. The SCSI standards define commands, protocols, electrical, optical and logical interface ...
device needs to report an error.
SCSI communication takes place between an
initiator
An initiator can refer to:
* A person who instigates something.
* Modulated neutron initiator, a neutron source used in some nuclear weapons
** Initiator, an Explosive booster
** Initiator, the first Nuclear chain reaction
* Pyrotechnic initiator, ...
and a
target
Target may refer to:
Physical items
* Shooting target, used in marksmanship training and various shooting sports
** Bullseye (target), the goal one for which one aims in many of these sports
** Aiming point, in field artillery, fi ...
. The initiator sends a
command
Command may refer to:
Computing
* Command (computing), a statement in a computer language
* COMMAND.COM, the default operating system shell and command-line interpreter for DOS
* Command key, a modifier key on Apple Macintosh computer keyboards
* ...
to the target which then responds. SCSI commands are sent in a Command Descriptor Block (
CDB). At the end of the command the target returns a
Status Code byte which is usually 00h for success, 02h for a Check Condition (error), or 08h for busy.
When the target returns a Check Condition in response to a command, the initiator usually then issues a
SCSI Request Sense command
Small Computer System Interface (SCSI, ) is a set of standards for physically connecting and transferring data between computers and peripheral devices. The SCSI standards define commands, protocols, electrical, optical and logical interface ...
in order to obtain more information. During the time between the reporting of a Check Condition and the issuing of a Request Sense command, the target is in a special state called a
Contingent Allegiance Condition.
{{DEFAULTSORT:Scsi Check Condition
Check Condition