User's Guide

Commands: Mode Sense (1Ah) Page 99
Medium Partition Page (11h)
The Medium Partition page indicates single- or dual-partition tape format. the MODE
SENSE command specifying a Medium Partition page can be executed at any
logical position. The tape does not need to be positioned at BOM. The layout of this
page is shown in the following table.
Byte
Bits
7 6 5 4 3 2 1 0
0 0 0 | Page Code (11h)
1 Page Length (06h)
2 Maximum Additional Partitions
3 Additional Partitions Defined
4 0 0 0 | PSUM | 0 0 0
5 0 0 0 0 0 0 1 1
6 0 0 0 0 0 0 0 0
7 0 0 0 0 0 0 0 0
8 MSB—Additional Partition Size
9 Additional Partition Size—LSB
Medium Partition Page Field Descriptions
The following table describes the fields in the Medium Partition page.
Field
Name Bytes Bits Description
Page Code 0 0-5 The Page Code field must be set to 11h to select this page.
Page
Length
1 If the current format is a single-partition tape, the Page Length byte is
set to 6 (06h), indicating that 6 parameter bytes follow the Page
Length byte.
If the current format is a dual-partition tape, the Page Length is set to
8 (08h), indicating that eight parameter bytes follow the Page Length
byte.
Maximum
Additional
Partitions
2 This field returns a 1 to indicate that at most only 1 additional partition
can exist for a dual-partitioned tape.
Additional
Partitions
Defined
3 This field indicates the number of additional partitions on the current
tape. A zero specifies a single-partitioned tape; a one specifies a dual-
partitioned tape.
PSUM 4 3-4 The Partition Size Unit of Measure (PSUM) field defines the units in
which the partition size descriptors select the partition size. The valid
values are as follows. The default is 10 (megabytes).
4 3 Unit
0 0 bytes
0 1 kilobytes
1 0 megabytes
Additional
Partition
Size
8-9 The Partition Size field defines the size of Partition 1 (the first partition
on a dual-partition tape) in the units specified in the PSUM field. Byte
8 is the MSB, and byte 9 is the LSB.