User's Guide

Page 84 DDS-4 SCSI Interface Manual, Rev. B
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 no additional partition is to be defined or if going from a dual-
partition format to a single-partition format, the Page Length field
must be set to 6 (06h), which indicates that 6 parameter bytes follow
the Page Length byte.
If an additional partition is to be defined (dual-partition), this field is
set to 8 (08h).
Maximum
Additional
Partitions
2 7-0 The Maximum Additional Partitions field indicates the maximum
number of additional partitions supported by the drive that can exist
on a cartridge.
Additional
Partitions
Defined
3 The Additional Partitions Defined field specifies the number of
partitions to add when formatting the tape. This bit may be set by the
initiator to 1 (dual partitions) or 0 (single partition), which specifies the
desired number of additional partitions to format on the tape when the
IDP bit = 1 or the SDP bit = 1.
SDP bit 4 6 If the SDP bit is set to 1 the drive automatically formats a partition 1
with a capacity of approximately 100 MB. The following conditions
are also required:
• The Additional Partition byte =1. If the Additional Partition byte = 0,
the SDP bit is ignored.
• IDP bit = 0. The SDP and IDP bits cannot be set at the same time.
• If the SDP bit=1 then the Additional Partitions byte must also be 1.
CAUTION: Setting the SDP bit causes the tape to be reformatted to a
2 partition tape. All previous information recorded on the cassette is
destroyed.
IDP bit 4 5 If set to 1, the Initiator Defined Partitions bit causes the drive to
partition the tape into 1 or 2 partitions as specified by the Additional
Partitions Defined field and the partition size descriptors.
CAUTION: Setting the IDP bit causes the tape to be reformatted to a
1- or 2-partition tape. All previous information recorded on the
cassette is destroyed.
PSUM 4 3-4 The partition Size Unit of Measure field defines the units in which the
partition size descriptors select the partition size. The valid values
are:
4 3 Unit
0 0 bytes
0 1 kilobytes
1 0 megabytes
Medium
Format
Recognition
5 7-0 Medium Format Recognition field must be set to 3 indicating the drive
is capable of recognizing both the format and the partitions.
Additional
Partition
Size
8-9 The Partition Size field indicates the size of the additional partition
(partition 1) formatted on the tape when formatting a dual-partition
tape. The first physical partition is partition 1. The remainder of the
tape is partition 0.