Table 5-169Sense Data Fields (Error Code 70h)-Field Descriptions

 

 

 

Field

 

Definition

 

 

Valid

The Valid bit, when set to 1, indicates that the Information field contains valid information, as defined

below. When set to 0, it indicates that the contents of the Information field are not as defined below.

 

Error Code

Either 70h, indicating that current errors are to be reported, or 71h, indicating deferred errors are to be

reported.

 

 

 

 

 

Segment

This feature is not supported and will return a zero value.

Number

 

 

 

FileMrk

The File Mark field is reserved for sequential access devices. This field will return a zero value.

 

 

EOM

The End-of-Medium field is reserved for sequential access and printer devices. This field will return a

zero value.

 

 

 

 

 

ILI

Incorrect Length Indicator. When this bit is set to 1, it indicates that the requested logical sector length

did not match the logical sector length of the data on the media. This field is only set for incorrect byte

 

transfer lengths on a READ LONG and WRITE LONG command descriptor block.

 

The sense key, additional sense code, and additional sense code qualifier provide a hierarchy of infor-

Sense Key

mation. The sense key provides the highest level of information about error and exception conditions.

The additional sense code and qualifier provided more detailed information.

 

The sense keys supported by the drive are described in Table 5-173.

 

 

 

The Information field contains the following device-type or command-specific information:

 

1) The unsigned logical sector address associated with the sense key.

Information

2) The difference between the requested length and the actual length in either bytes or sectors, as de-

 

termined by the command. This difference is called the residue.

 

3) A description of each of the drive's supported commands definition for this field is contained in Ta-

 

ble 5-171.

 

 

Additional

The Additional Sense Length field indicates the number of addition sense bytes that can follow. If the

Sense

Allocation Block Length specified in the Command Descriptor Block is too small to transfer all of the

Length

additional sense bytes, the Additional Sense Length byte value is not adjusted to reflect the truncation.

Command-

The Command-Specific Information field is valid only for Sense Data for a failed REASSIGN

Specific In-

BLOCKS command. It contains either the Logical Block Address of the first defect descriptor not re-

formation

assigned or, if all the defect descriptors were reassigned, FFFFFFFFh.

Additional

The Additional Sense Code field indicates further information related to the error or exception condi-

tion reported in the sense key. If the drive does not have further related information, the additional

Sense Code

sense key is set to NO ADDITIONAL SENSE INFORMATION. See Table 5-172.

 

 

 

 

 

Additional

The Additional Sense Code Qualifier field indicates detailed information related to the additional sense

Sense Code

code. If the drive does not have detailed information, the field is set to 0.

Qualifier

 

 

 

 

 

 

 

Field Re-

The Field Replaceable Unit Code specifies a unit that has failed:

placeable

Unit

 

 

 

 

Code

 

FRU

 

 

 

 

 

1

 

Host

 

 

 

 

 

2

 

Hard Disk Assembly (HDA)

 

 

 

 

 

3

 

Printed Circuit Board Assembly (PCBA)

 

 

 

SKSV

Sense-Key Specific Valid bit. This bit is 1 for all sense keys listed in Table 5-170(exception: NOT

READY and UNIT ATTENTION/RPL Status Change). The SKSV bit and Sense-Key Specific bytes

 

may be 0 when the sense key is NOT READY.

Sense-Key

The contents of the Sense-Key Specific field are unique to each sense key. Table 5-171summarizes

Specific

the sense keys for which the drive supplies sense-key specific information. (See SKSV.)

5-116 Maxtor Atlas 10K V