Freecom FC TapeWare AIT-250i FC, Specification

Page: 89 / 164

MODE SELSECT 6.Command Specification
SONY AIT-E Turbo drive SDX-250V series Ver.1.0 6-37
Partition 1
Three Partitioned Tape
User
Data
Area
BOM BOT
Partition 0
EOT
EOP/
EOM
Device
Area System
Area EOD
Partition 2
DEV
User
Data
Area
System
Area EOD DEV
User
Data
Area
System
Area EOD
Partition 1
Two Partitioned Tape
User
Data
Area
BOM BOT
Partition 0
EOT
EOP/
EOM
Device
Area System
Area EOD DEV
User
Data
Area
System
Area EOD
Single Partitioned Tape
User
Data
Area
BOM BOT
Partition 0
EOT
EOP/
EOM
Device
Area System
Area EOD
BOM = Beginning-of-Media (Physical)
BOT = Beginning-of-Tape (Logical)
EOM = End-of-Media (Physical)
EOP = End-of-Partition (Logical)
EOT = End-of-Tape (Logical)
Figure 6-2: Tape Partition Layout
A tape does not require partitioning prior to use. On the first WRITE to a blank tape, the device creates the System,
Reference and Vendor areas before proceeding with the write. In order to reformat media from a two to a single, or
from a single to a two partition tape, the Host is required to use the Medium Partitions Parameter page.
PSUM: Partition Size Unit of Measured field defines the units in which the Partition Size value selects the partition
size, which in the case of this drive is Megabytes. Therefore, the drive returns 10b for a MODE SENSE and will only
accept this value for a MODE SELECT, otherwise a CHECK CONDITION status is returned with an ILLEGAL
REQUEST Sense Key
set.
Medium Format Recognition: This field is only valid in response to the MODE SENSE command and is set to 03h
in order to indicate that the drive is capable of format and partition recognition. This is non-changeable field. It
accepts any values, and always returns 1.
Partition Sizes: This field allows the initiator to allocate the capacity for each partition. It will also allow the initiator to
reallocate the capacity of previously partitioned tapes.
The Partition Size specifies the capacity of all partitions in Megabytes (in the case of SDX-250V-see PSUM field
definition). The drive rounds the Partition Size to the next whole group value and then applies an algorithm which
allows for the writing of ECC-3 frames and for RAW error recovery so as to reserve sufficient physical space on the
media for the specified capacity. The minimum space allocated shall be 3050 frames.