Maxtor ATLAS 10K III Manual download pdf (Page 239)

SCSI Description

5–172 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives

REQUEST SENSE Command (03h) (continued)

5.34.2 Clearing Sense Data

Sense data is cleared from the drive's memory by one of the following conditions:

• After being returned from a REQUEST SENSE command.

• As soon as any other command is received from the initiator except INQUIRY.

5.34.3 Status Reporting

The drive returns CHECK CONDITION status for a REQUEST SENSE command

only to report errors specific to the command when:

• A non-zero reserved bit is detected in the Command Descriptor Block.

• A drive malfunction prevents return of the sense data.

For Parallel SCSI disk drives, the drive also returns CHECK CONDITION status for

a REQUEST SENSE command to report errors specific to the command when an

unrecovered parity error is detected on the data bus.

Note that any of the previous conditions overwrites the current sense data with the

sense data describing the error encountered by the REQUEST SENSE command

(that is, for the condition stated in the first bulleted entry, the new sense data

reflects that a non-zero reserved bit was detected in the Command Descriptor Block).

The drive returns a maximum of 18 bytes of sense data. The initiator should set the

Allocation Length field in the Command Descriptor Block to 18 to receive all sense

data. If the Allocation Length is set to 0, four bytes of data will be returned (this

option maintains compatibility with SCSI-1 systems).

5.34.4 Sense Data Format for Error Code 70h and Error Code 71h

The sense data format for error code 70h (current error) and error code 71h (deferred

error) is shown in Figure 5-85; the data fields are defined in Table 5-83.

1 2 ... 234 235 236 237 238 239 240 241 242 243 244 ... 370 371

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Maxtor ATLAS 10K III Manual Page 239