User Manual

SCSI Commands Reference Manual, Rev. J 512
www.seagate.com Parameters for direct access devices
PERIPHERAL QUALIFIER and PERIPHERAL DEVICE TYPE fields
The PERIPHERAL QUALIFIER field and PERIPHERAL DEVICE TYPE field are defined in standard INQUIRY data (see 3.6.2).
PAGE CODE and PAGE LENGTH fields
The PAGE CODE field and PAGE LENGTH field are defined in SPC-5 and shall be set to the values shown in table 485 for the Zoned Block Device
Characteristics VPD page.
URSWRZ bit
0 An unrestricted read in sequential write required zone (URSWRZ) bit set to zero indicates that the device server does not support read-
ing unwritten logical blocks or reads across zone boundaries in sequential write required zones.
1 A URSWRZ bit set to one indicates that the device server supports reading unwritten logical blocks and reads across zone boundaries in
sequential write required zones.
OPTIMAL NUMBER OF OPEN SEQUENTIAL WRITE PREFERRED ZONES field
The OPTIMAL NUMBER OF OPEN SEQUENTIAL WRITE PREFERRED ZONES field indicates the recommended upper limit for the number of
sequential write preferred zones that are open zones. A value of FFFF_FFFFh indicates that the optimal number of sequential write preferred
zones that are open zones is not reported.
OPTIMAL NUMBER OF NON-SEQUENTIALLY WRITTEN SEQUENTIAL WRITE PREFERRED ZONES field
The OPTIMAL NUMBER OF NON-SEQUENTIALLY WRITTEN SEQUENTIAL WRITE PREFERRED ZONES field indicates the recommended upper limit
for the number of sequential write preferred zones in which at least one non-sequential write operation has occurred (see ZBC). A value of
FFFF_FFFFh indicates that the optimal number of non-sequentially written sequential write preferred zones is not reported.
MAXIMUM NUMBER OF OPEN SEQUENTIAL WRITE REQUIRED ZONES field
The MAXIMUM NUMBER OF OPEN SEQUENTIAL WRITE REQUIRED ZONES field indicates the maximum number of sequential write required
zones that are allowed to be open zones (see ZBC). A value of FFFF_FFFFh indicates that there is no limit for the number of sequential write
required zones having a Zone Condition of IMPLICIT OPEN and EXPLICIT OPEN.