Descriptor format

The Descriptor format of the returned data is as follows:

 

 

7

6

5

4

 

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

0

Valid

 

 

 

Response Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

Reserved(0)

 

 

 

Sense Key

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

Additional Sense Code

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

Additional Sense Code Qualifier

 

 

 

 

 

 

 

 

 

 

 

 

 

4–6

 

 

 

Reserved (0)

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

Additional Sense Length (n–7)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

(MSB)

 

 

Sense Data Descriptor 0

 

 

 

 

 

 

 

 

 

 

 

 

:

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

:

 

 

 

Sense Data Descriptor X

 

 

 

 

n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Returned Sense data fields:

Response Code 72h The error is current, that is, it is associated with the command for which CHECK CONDITION status has been reported.

73h The error is deferred. A deferred error occurs when there is a failure for an operation that has already been terminated with a GOOD status, or when failure occurs in “cleanup” activity following an operation that was terminated by BUS RELEASE. The command for which CHECK CONDITION status was reported is therefore unlikely to be the cause of the deferred error. It simply gives the drive the opportunity to report CHECK CONDITION status for an error that already exists.

Additional Sense

The number of additional sense bytes to follow, ≤ 244. It is never truncated to reflect

Length

the actual Transfer Length.

 

 

Additional Sense

Additional information about the cause of the CHECK CONDITION, or the current

Code and Qualifier

tape position when the REQUEST SENSE is unsolicited. See “Additional Sense

 

Codes” on page 159.

 

 

Sense Data

At least one descriptor is sent (Drive Error Code), the others may or may not be sent

Descriptor

depending on the nature of the CHECK CONDITION.

 

 

152 Commands