Tandberg Data SLR7-140 PROGRAMMER Manual page 25

Tandberg Data
When the IDP bit is zero, the second method is used. In
this case the FDP bit is used to select one or two fixed
size partitions.
often called " Quick File Access" (QFA).
Regardless of which method is used, executing a MODE
SELECT command where the Medium Partition Page(1) is
included in the
partitioning will take place. This means that such a
MODE SELECT command is only accepted at the beginning of
partition 0 (BOP0).
The Partition Size Unit of Measure (PSUM) field defines
the unit of the Partition Size Descriptors.
2 specifies the unit to be MBytes and a value of 3
specifies the unit to be GBytes.
ignore this field when the IDP bit is not set.
SENSE will return 2 (MBytes) in this field when the
currently mounted volume has a capacity (uncompressed)
of 65535 MBytes or less.
(GBbytes) in this field when the capacity is above 65535
MBytes. This boundary
(FFFFh) is the
Descriptors.
The Partition Units
Partition Size Descriptors when the PSUM field is set to
3. The Partition Units must be set to 9 when the PSUM
field is set to 3 to indicate that GBytes (10
only supported unit.
The Maximum Additional Partitions field is ignored by
the MODE SELECT
Page(1) is returned by the MODE SENSE command this field
is used to indicate the maximum number of partitions (in
addition to the
medium is able to hold.
The Additional
specify the requested number of partitions (MODE SELECT)
or it shows the
SENSE). The Partitions
specify the requested
SELECT) or to show the current (estimated) size of each
partition (MODE SENSE).
Note that setting the IDP or FDP bits to one is only
allowed when the
SLRtape140 to SLRtape7 or SLR32, medium. In this case a
maximum of 24
SLRtape140, SLRtape100,
SLRtape40 medium. A maximum of 36 partitions is allowed
when using a SLRtape50, SLR32 or SLRtape24 medium.
maximum of 3 partitions is allowed when using a SLRtape7
medium. (See also section 2.3.3 Using Initiator Defined
Partitions).
When using other medium types, partitioning can not be
used and only a single partition is available.
When partition sizes are quoted later on in this
section, all sizes are uncompressed sizes.
2-5 Tandberg SLR Product Line SCSI Functional Specifications
This method of
parameter list,
MODE SENSE will return 3
is introduced
maximum value of
field defines
command. When
default partition)
Partitions Defined
actual number
Size Descriptors
size of
medium to
partitions is
SLRtape75,
About Tape Streamers
using partitions
some form
A value of
MODE SELECT will
because
the Partition
the unit of
9
) is the
the Medium Partition
that the current
field is used
of partitions
is used
each partition
be partitioned
allowed when using
SLRtape60
is
of
MODE
65535
Size
the
to
(MODE
to
(MODE
is a
a
or
A