Tandberg Data
About Tape Streamers
2-4
Tandberg SLR Product Line SCSI Functional Specifications
2.3.1.
Partitioning a Volume
Setting up a Medium Partition page and then executing a
MODE SELECT command transferring this page to the Drive
can partition a volume. The table below shows the parts
of the Medium Partition Page(1) that relate to this
procedure. Fields of no interest are marked with
“ XX...XX” .
BYTE
BIT 7
6
5
4
3
2
1
0
00
PS
XX
Page Code = 11h
01
Parameter Length = 4Eh
02
Maximum Additional Partitions
03
Additional Partitions Defined
04
FDP
SDP
IDP
PSUM
XX
XX
XX
05
XXXX
06
XXXX
Partition Units
07
XXXX
08
Partition Size Descriptor 0
09
|
. . .
|
78
Partition Size Descriptor 35
79
Table 2-1: The Medium Partition Page(1)
Note that the Tandberg SLR Product Line Tape Drives use
the long form of the Medium Partition Page(1). This
means that the Partition Size Descriptor fields are
always present (both in MODE SELECT and MODE SENSE
parameter data).
Note also that the Medium Partition Page(1) is not
savable (the MODE SENSE command returns a Medium
Partition Page(1) where the PS bit is set to zero).
Partitioning a volume is only allowed when the volume is
positioned at BOM (the beginning of partition 0). Note
also that a partition operation may lead to a loss of
all existing data (the Drive runs an erase pass in each
of the existing partitions if the new partitioning is
different from the existing partitioning found on the
medium).
The Tandberg SLR Product Line Tape Drives allow the
Initiator to specify partitioning using two different
methods. The first is the most general. The Initiator
can specify both the number of partitions and their
individual sizes. Using the second method the Initiator
may only specify whether one or two partitions are
requested. When a single partition is requested it will
cover the whole medium. When two partitions are re-
quested the Drive will allocate them fixed sizes (there
will be one large and one small partition).
The Initiator Defined Partitions (IDP) bit is used to
select between the two methods. When the IDP bit is one,
the first method is used (the number and size of
partitions may be specified).
