Partitioning A Volume - Tandberg Data SLR7-140 PROGRAMMER Manual

BYTE BIT 7
00 PS
01 Parameter Length = 4Eh
02 Maximum Additional Partitions
03 Additional Partitions Defined
04 FDP
05
06
07
08 Partition Size Descriptor 0
09
| . . .
|
78 Partition Size Descriptor 35
79
Table 2-1:
Tandberg Data
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
" XX...XX" .
6 5
XX Page Code = 11h
SDP IDP
XXXX
XXXX
XXXX
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
always present
parameter data).
Note also that
savable (the MODE
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
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
partitions may be specified).
2-4 Tandberg SLR Product Line SCSI Functional Specifications
of no interest
4 3
PSUM
Partition Units
Partition Size
(both in MODE
the Medium Partition
SENSE command
whether one
is used (the
About Tape Streamers
are marked
2 1
XX XX
Descriptor fields
SELECT and MODE
Page(1)
returns a
or two partitions
number and size
with
0
XX
are
SENSE
is not
Medium
are
of