Specifications

ATAPI For Streaming Tape QIC-157 Rev B

6.8.2. INQUIRY Command

The INQUIRY command requests that information regarding parameters of the Device be sent to

the Host. An option allows the Host to request additional information about the Device.

Table 6-7 INQUIRY Command

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation code (12h)

1 Reserved Reserved

(EVPD)

2 Reserved (Page Code)

3 Reserved

4 Allocation Length

5 Reserved

6 Reserved

7 Reserved

8 Reserved

9 Reserved

10 Reserved

11 Reserved

The INQUIRY command shall return “Check Condition” status only when the Device cannot return

the requested INQUIRY data. The INQUIRY data should be returned even though the Device may

not be ready for other commands.

If an INQUIRY command is received with a pending unit attention condition (i.e. before the Device

reports “Check Condition” status), the Device shall perform the INQUIRY command and shall not

clear the unit attention condition.

6.8.2.1.Standard INQUIRY Data

The standard INQUIRY data contains 36 required bytes, followed by a variable number of vendor-

specific parameters. Bytes 56 through 95, if returned, are reserved for future standardization.