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Tandberg Data
About Tape Streamers
2-3
Tandberg SLR Product Line SCSI Functional Specifications
Beginning-Of-Media
This area holds no user data. It is used to record a
special reference burst as defined in [9], [10]. This
area starts with the BOT (Beginning Of Tape) tape marker
and ends at the LP (Load Point) tape marker.
Recording Area
This area holds the user data. This area starts with the
LP (Load Point) tape marker and ends at the LEW (Logical
Early Warning) marker.
Early-Warning Area
When writing, the Initiator needs an indication that it
is approaching the end of the Recording-Area. This
position called Logical Early Warning (LEW) is reported
to the Initiator at a position early enough for the
Drive to write out any buffered data to the medium while
still leaving enough room for additional recorded data
or tapemarks. The actual amount of data is user
configurable, see the LEW Position field in Section
14.3.9. This area ends at the EW (Early Warning) tape
marker.
End-Of-Media
This is the short area between the EW (Early Warning)
and the EOT (End-Of-Tape) tape markers. It is usually
possible to complete the writing of a single last frame
between EW and EOT. When this has been done or when EOT
is found, all further write operations are discontinued
even if the there are more data to be written in the
data buffer.
2.3.
Partitions Within a Volume
A volume may be split into several mini-volumes called
partitions. Each partition has its own set of beginning
and ending points. Each partition within a volume has
defined its own Beginning-Of-Partition (BOP), Recording-
Area, Early-Warning-Area and End-Of-Partition (EOP).
In the first partition (partition zero) on a volume with
n partitions, BOP is identical to BOM. In the last
partition on a volume (partition n-1), EOP is identical
to EOM.
All volumes have a minimum of one partition called
partition zero, or the default partition.
When a volume is mounted (that is inserted into the
Drive and then loaded), the volume is logically
positioned to the beginning of the default partition
(partition zero). This is also true when a LOAD command
(with the Load bit set to one) is executed. When a
REWIND or ERASE command is received in any partition,
the Drive positions to the beginning of the current
partition.