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through a 'discovery phase' with the enclosure as defined in the SFF-8067 standard. The results of this discovery phase deter-
mine whether the enclosure: 1) does not support Enclosure Services, 2) supports only the 'short' Enclosure Services mode as
defined by SFF-8045, or 3) supports the 'long' Enclosure Services mode as defined by SFF-8067. After the discovery phase,
the drive behaves in accordance with the Enclosure Services mode capabilities of the enclosure. The drive does not attempt to
remember the Enclosure Services capabilities of the enclosure, but rather, in accordance with the SFF-8067 standard, re-per-
forms the discovery phase for each SEND and RECIEVE DIAGNOSTIC command received.
Short
Long
Note: For a more detailed description of Enclosure Services, please refer to the following specifications:
•
SFF-8067 Specification
21.15.1 Enclosure Initiated ESI
This drive supports Enclosure Initiated ESI as described in the SFF-8067 standard.
21.16 Multiple Initiator Environment
21.16.1 Initiator Sense Data
Separate sense data is reserved for each I-T-L. Each sense data is maintained independent of commands from other initiators.
21.16.2 Initiator Mode Select/Mode Sense Parameters
A single shared copy of the Mode Select/Mode Sense parameters is maintained by the drive. This includes both the current and
saved parameters.
21.17 Reset
Reset actions will return the drive to a known, initialized state.
This device supports the Hard reset option as defined in the SCSI standards (see 7.1.9 Dev_Ctrl_Code_x on page 33) and the
reset sources discussed below.
This mode is defined for use when an Enclosure simply supplies an 7-bit parame-
ter as defined by the SFF-8045 standard to the drive.
When mounted in this type of Enclosure, an attempt to access any Enclosure Ser-
vice Diagnostic Page using the SEND DIAGNOSTIC command will terminate the
command with CHECK CONDITION status. The sense data will have a Sense
Key of Illegal Request and an Additional Sense Code of UNSUPPORTED
ENCLOSURE FUNCTION.
Requesting any Enclosure Service Diagnostic Page using the RECEIVE DIAG-
NOSTIC RESULTS command will return only Diagnostic Page 08h (Short Enclo-
sure Status).
This form is defined for use when the Enclosure and target are able to communi-
cate using the secondary interface as defined in the SFF-8067 standard.
When mounted in this type of Enclosure, any attempt to access an Enclosure Ser-
vice Diagnostic Page using the SEND DIAGNOSTIC or RECEIVE DIAGNOS-
TIC RESULTS commands results in the Diagnostic Page being transferred to/from
the enclosure. CHECK CONDITION status and sense data with an appropriate
Sense Key and Additional Sense Code is generated if the transfer fails or cannot be
performed.
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
332
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