Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
77
17.6.2
TASK Information Units
Table 44 TASK Information Unit
Byte
Bit
7
6
5
4
3
2
1
0
0-7
Logical Unit Number
8-9
Reserved
10
Task Management Function
11
Reserved
12-13
Tag of Task to be Managed
14-27
Reserved
 Logical Unit Number field contains the address of the logical unit. The drive only supports a LUN of 0’s.
 Task Management Function field is defined as follows:
Table 45 TASK MANAGEMENT FUNCTION Field
Value Function
01h
ABORT TASK: The drive shall perform the ABORT TASK associated with the value of the TAG OF TASK
TO BE MANAGED field
02h
ABORT TASK SET: The drive shall perform the ABORT TASK SET by aborting all outstanding tasks for
the Initiator that sent the TMF.
04h
CLEAR TASK SET: This TMF causes the drive to abort all tasks in the task set. The action is equivalent
to receiving a series of Abort Task requests from all Initiators.
A unit attention condition shall be generated for all other Initiators with tasks in the task set. The
Additional Sense Code shall be Commands cleared by another Initiator.
08h
LUN RESET: The LUN RESET causes the Target to execute a hard reset. This means:
1. Abort all tasks for all Initiators on either both ports.
2. Release any device reservation on either port.
3. Set a Unit Attention condition for all Initiators.
10h
I_T NEXUS RESET: The I_T NEXUS RESET causes the drive to abort all outstanding tasks for the
Initiator that sent the TMF. In addition, a Unit Attention is set for the initiator that sent the TMF,
indicating I_T NEXUS LOSS. This TMF does not affect task sets for other initiators.
40h
CLEAR ACA (not supported)
80h
QUERY TASK: The drive shall return a response of FUNCTION SUCCEEDED if the specified task
exists, or FUNCTION COMPLETE if the specified task does not exist.
81h
QUERY TASK SET: The drive shall return a response of FUNCTION SUCCEEDED if there is any task
exist, or FUNCTION COMPLETE if there is no task exist.
82h
QUERY ASYNCHRONOUS EVENT (formerly QUERY UNIT ATTENTION): The drive shall return a
response of FUNCTION SUCCEEDED if there is a unit attention or a deferred error pending, or
FUNCTION COMPLETE if there is no unit attention or no deferred error pending.