Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
97
18.5
INQUIRY (12)
Table 69 INQUIRY (12)
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
The INQUIRY command requests the parameters of the Target 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 70 Page Code descriptions
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.
Allocation Length specifies the number of bytes that the Initiator has allocated for INQUIRY data to be returned. An
allocation 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, 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).