71h

Indicates that 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.

 

Segment Number This field is cleared to zero.

 

 

 

Mark

1

The Mark bit is set to 1 if a SPACE, READ or VERIFY command did not

 

 

complete because a filemark was read. This bit may only be set if the sense

 

 

key is NO SENSE.

 

 

 

EOM

1

The End of Medium flag is set if a WRITE or WRITE FILEMARKS command

 

 

completed in the early warning area. If no other error occurred, the sense

 

 

code will be set to NO SENSE with additional sense of 0002h (EOT). If

 

 

another error occurred, the sense code and additional sense will reflect that

 

 

error. It is also set if BOP is encountered while spacing over blocks or

 

 

filemarks in the reverse direction.

 

 

 

ILI

1

Indicates that the requested block length did not match the actual block

 

 

length. Only READ and VERIFY can cause this bit to be set.

 

 

Sense Key

See “Sense Keys” on page 157 for details of sense keys that can be returned.

Information Bytes

The Information Bytes field is only valid if the Valid bit is set. It contains residue

 

information following the failure of either a READ, WRITE, WRITE FILEMARKS or SPACE

 

command. The field can take a negative value, expressed in 2’s complement

 

notation for the SPACE command. See the description of the command that failed for

 

the contents of the field.

 

 

 

Additional Sense

10h

Specifies the number of additional sense bytes to follow. It is never truncated

Length

 

to reflect the actual Transfer Length.

 

 

 

Command Specific

0

Provides additional information specific to the failing command. The field is

Information Bytes

 

normally set to 0.

 

 

Additional Sense

These two bytes provide additional information about the cause of the CHECK

Code and Qualifier

CONDITION, or the current tape position when the REQUEST SENSE is unsolicited.

 

See “Additional Sense Codes” on page 159.

 

 

 

SKSV

0

The Sense Key Specific Bytes (bytes 15 through 17) are invalid. The C/D,

 

 

BPV and Bit pointer fields will be zero. The top byte of the Field Pointer will

 

 

be zero, and the bottom byte will contain a product-specific error code.

1The Sense Key Specific Bytes are valid. This will only happen when the bytes assume the role of Field Pointer Bytes as defined by ANSI. This occurs when an Illegal Field check detects an error in a command descriptor block or a Parameter List check detects an error in a command parameter list.

C/D

Command Data. Only valid if the SKSV flag is set.

0The Field Pointer information applies to the parameter list for the command.

1The Field Pointer information applies to the command descriptor block.

150 Commands