SCSI Commands - USB Mass Storage: Designing and Programming Devices and Embedded Hosts - page 140

Table 6-3: The response to an INQUIRY command is at least 36 bytes. The SPC
specification has more details on these fields.
Byte Description

0 Bits 7..5: PERIPHERAL QUALIFIER (000 = a device is connected to this logical unit)

Bits 4..0: PERIPHERAL DEVICE TYPE (PDT)

1 Bit 7: RMB (0 = non-removable media; 1 = removable media)

Bits 6..0: reserved

2 VERSION of SPC standard (5 = SPC-3; 4 = SPC-2)

3 Bits 7..6: obsolete

Bit 5: NORMACA (normal ACA bit support)
Bit 4: HISUP (hierarchical addressing support)
Bits 3..0: response data format (must = 2)

4 ADDITIONAL LENGTH (the number of additional bytes in the response). Equal to

(response length - 4). Set to 20h if returning 36 (24h) bytes.

5 Bit 7: SCCS (0 = no embedded storage array controller component present)

Bit 6: ACC (0 = no access controls coordinator present)
Bits 5..4: TPGS (0 = no support or vendor-specific support for asymmetric logical unit
access)
Bit 3: 3PC ((0 = no support for third-party copy commands)
Bits 2..1: reserved
Bit 0: PROTECT (0 = no support for protection information)

6 Bit 7: BQUE (0 = no support for basic task management)

Bit 6: ENCSERV (0 = no support for embedded enclosure services)
Bit 5: VS (vendor specific)
Bit 4: MULTIP (0 = device has a single port)
Bit 3: MCHNGR (0 = no support for media changer)
Bits 2..1: obsolete
Bit 0: ADDR16 (not used with USB interface)

7 Bit 7..6: obsolete

Bit 5: WBUS16 (not used with USB interface)
Bit 4: SYNC (not used with USB interface)
Bit 3: LINKED (0 = no support for linked commands)
Bit 2: obsolete
Bit 1: CMDQUE (0 = no support for full task management)
Bit 0: VS (vendor specific)

8..15 T10 VENDOR IDENTIFICATION, MSB first

16..31 PRODUCT IDENTIFICATION, MSB first

32..35 PRODUCT REVISION LEVEL, MSB first