User Manual

SCSI Commands Reference Manual, Rev. J 469
www.seagate.com Parameters for direct access devices
5.4.2 ASCII Information VPD page (01h - 7Fh)
The ASCII Information VPD page (see table 438) contains information for the field replaceable unit code returned in the sense
data (see 2.4).
PERIPHERAL QUALIFIER and the PERIPHERAL DEVICE TYPE fields
The PERIPHERAL QUALIFIER field and the PERIPHERAL DEVICE TYPE field are defined in standard INQUIRY data (see 3.6.2).
PAGE CODE field
The PAGE CODE field contains the same value as in the PAGE OR OPERATION CODE field of the INQUIRY CDB (see 3.6) and is associated with the
FIELD REPLACEABLE UNIT CODE field returned in the sense data.
NOTE The FIELD REPLACEABLE UNIT CODE field in the sense data provides for 255 possible codes, while the
PAGE CODE field provides for only 127 possible codes. For that reason it is not possible to return ASCII
Information VPD pages for the upper code values.
PAGE LENGTH field
The PAGE LENGTH field specifies the length of the following VPD page data. The relationship between the PAGE LENGTH field and the CDB
ALLOCATION LENGTH field is defined in 2.2.6.
ASCII LENGTH field
The ASCII LENGTH field specifies the length in bytes of the ASCII INFORMATION field that follows. A value of zero in this field indicates that no
ASCII information is available for the specified page code. The relationship between the ASCII LENGTH field and the CDB ALLOCATION LENGTH
field is defined in
2.2.6.
ASCII INFORMATION field
The ASCII INFORMATION field contains ASCII information concerning the field replaceable unit identified by the page code. The data in this
field shall be formatted in one or more character string lines. Each line shall contain only graphic codes (i.e., code values 20h through 7Eh) and
shall be terminated with a NULL (00h) character.
VENDOR SPECIFIC INFORMATION field
The contents of the vendor specific information field is not defined in this manual.
Table 438 ASCII Information VPD page
Bit
Byte
7 6 5 4 3 2 1 0
0 PERIPHERAL QUALIFIER PERIPHERAL DEVICE TYPE
1 PAGE CODE (01h - 7Fh)
2 Reserved
3 PAGE LENGTH (N-3)
4 ASCII LENGTH (M-4)
5 (MSB)
ASCII INFORMATION. . .
m (LSB)
m+1
Vendor specific information. . .
n