Hitachi ULTRASTAR 15K450 HUS154530VLF400 - Manual (Page 141)

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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19.5 INQUIRY (12)
Table 107: INQUIRY (12)
The INQUIRY command requests the parameters of theTarget to be sent to the Initiator.
An EVPD An EVPD bit of one specifies that the target return the vital product data page identified by the Page Code field in
the CDB The available VPD pages are defined in the addendum provided for each different drive model in the section entitled
Inquiry Data Format.
The Page Code specifies which page of vital product data information the drive shall return.
Table 108: Page Code descriptions
Allocation Length specifies the number of bytes that the Initiator has allocated for INQUIRY data to be returned. An alloca-
tion length of zero implies that no data is to be returned. The Target will terminate the DATA IN phase when all available
INQUIRY data has been transferred or when allocation length bytes have been transferred, whichever is less.
Note: If an INQUIRY command is received from an Initiator with a pending unit attention condition (before the target
reports Check Condition status), the Target processes the INQUIRY command. The unit attention condition is not cleared by
this action.
Note: The INQUIRY command is a Priority command and is not queued.
Note: The inquiry data is set at the time of manufacture and will not change (without a FRU change), with the following
exceptions:
• Product Revision Level (EVPD=0) can be changed when microcode is downloaded with the Write Buffer command..
• The information returned for EVPD=1, Page Code = 3 is not fixed.
Note: The inquiry data returned when media is not available will not be complete.
Byte 0 of the returned data on an INQUIRY command is the same no matter which page(s) is(are) returned. This description is
to be used for all the following page definitions.
The Peripheral Qualifier field of zero (0) indicates that the peripheral device is currently connected to this logical unit. A
Peripheral Device Type field of zero (0) indicates that this device is a Direct Access Storage Device (DASD).
Byte BIT
7 6 5 4 3 2 1 0
0 Operation Code = 12h
1 Reserved = 0 CmdDt =0 EVPD
2 Page Code
3 - 4 Allocation Length
5 VU = 0 Reserved = 0 FLAG LINK
EVPD
PAGE
CODE
Description
0 0 The Target returns the standard INQUIRY data.
0 Non Zero
The drive returns Check Condition status with the sense key of Illegal Request
and the additional sense code of Invalid Field in CDB.
1 Non Zero The drive returns the vital product data of page code requested.