User Manual

SCSI Commands Reference Manual, Rev. J 92

www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)

3.6 INQUIRY command

3.6.1 INQUIRY command introduction

The INQUIRY command (see table 58) requests that information regarding the logical unit and SCSI target device be sent to the

application client.

EVPD (Enable Vital Product Data) bit

An enable vital product data (EVPD) bit set to one specifies that the device server shall return the vital product data specified by

the PAGE CODE field (see 3.6.3).

If the EVPD bit is set to zero, the device server shall return the standard INQUIRY data (see 3.6.2). If the PAGE CODE field is not set to zero

when the EVPD bit is set to zero, the command shall be terminated with CHECK CONDITION status, with the sense key set to ILLEGAL

REQUEST, and the additional sense code set to INVALID FIELD IN CDB.

1 When the EVPD bit is set to one, the PAGE CODE field specifies which page of vital product data information the device server shall

return (see 5.4).

CMDDT (Command Support Data) bit

This bit has been declared obsolete by the T10 committee. However, it is included because it may be implemented on some products.See

SPC-2 for a description of this bit.

If both the EVPD and CMDDT bits are one, the target shall return CHECK CONDITION status with the sense key set to ILLEGAL REQUEST and an

additional sense code of Invalid Field in CDB. When the EVPD bit is one, the Page or OPERATION CODE field specifies which page of vital prod

uct data information the target shall return.

Table 58 INQUIRY command

Bit

Byte

7 6 5 4 3 2 1 0

0 OPERATION CODE (12h)

1 Reserved

Obsolete

Formerly

CMDDT

EVPD

2 PAGE CODE

3 (MSB)

ALLOCATION LENGTH

4 (LSB)

5 CONTROL