Sony AIT-SDX550, Руководство по техническим характеристикам продукции, Страница: 100 / 206

6.Command Specification MODE SELECT
6-46 SONY AIT-2 Turbo drive SDX-550V series Ver.1.0
Single Partition Tape
BOM BOT
Partition 0
EOP/EOM
Two Partition Tape
Partition 1
BOM
Device
Area
System
Area
User Data Area
End of
Data
BOT
Partition 0
EOP/EOM
Device
Area
System
Area User Data Area End of
Data User Data Area System
Area
End of
Data
EOT
EOT
EOT
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 6-1: Tape Partition Layout
The Host may, therefore, partition a tape into one partition which spans the whole physical length of the tape or into
two partitions, each of which will behave as completely separate and independent tapes.
A tape does not require partitioning prior to use. If a Host only wishes to use a single partition tape, then there is no
need to send this page. On the first WRITE to a blank tape, the device will create the System, Reference and Vendor
areas on tape before proceeding with the write. To reformat 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: The Partition Size Unit of Measured field defines the units in which the Partition Size value selects the
partition size.
Table 6-39: PSUM values
Code Description Support
00b bytes (unit of one) Not Support
01b kilobytes (10
3
bytes) Not Support
10b Megabytes (10
6
bytes) Optional
11b 10
(PARTITION UNITS)
bytes Optional
Partition Units: This field defines the size of the partition size descriptors when the PSUM field is set to 11b. A value
of n in the PARTITION UNITS field shall define the units of the partition size descriptors as 10 n bytes.
SDX-550V Supports following combinations.
PSUM Partition Units
10b 0000b: megabyte (AIT-1/2 Mode, AIT-E Turbo, AIT-1 Turbo)
11b 0111b: 10 7 byte (AIT-2 Turbo)
If another value is set these field a CHECK CONDITION status is returned with an ILLEGAL REQUEST sense key
set.
Medium Format Recognition: This field is only valid on a MODE SENSE and is set to 03h to indicate that the drive
is capable of format and partition recognition. This is non-changeable field. It accepts all the value, however always
returns 03.
EOP