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6.Command Specification MODE SELECT
6-46 SONY AIT-3Ex drive SDX-800V series Ver.1.1
6.7.5. Medium Partitions Parameter Page (11h)
The drive supports the Medium Partitions Parameter Page, which has the following format:
Table 6-43: Medium Partitions Parameter Page
Bit
Byte
7 6 5 4 3 2 1 0
0 PS (0) Reserved Page Code (11h)
1 Page Length (0Ah)
2 Maximum Additional Partitions (0h)
3 Additional Partitions Defined (00h)
4 FDP (0) SDP (0) IDP PSUM Reserved
5 Medium Format Recognition (03h)
6 Reserved Partition Units
7 Reserved
8 (MSB) Partition Size (Partition 0)
9 (LSB)
10 (MSB) Partition Size (Partition 1)
11 (LSB)
Warning: This page is used to format a tape to one partition. Extreme care must be used with this parameter page to
avoid accidental reformatting of a tape. Reformatting will destroy all previous data.
Maximum Additional Partitions: This field is only valid on MODE SENSE where it is used to report the maximum
number of additional partitions that are supported by the drive. This field is non-changeable, however it accepts all
values as a don’t care. This number is the maximum number of additional partitions supported.
Additional Partitions Defined: This field specifies the number of additional partitions to be defined for the tape
based on the IDP bit. The maximum allowed is the value returned in the Maximum Additional Partitions field.
FDP: The Fixed Data Partitions bit is not supported by the drive and if set, a CHECK CONDITION status is returned
with an ILLEGAL REQUEST Sense Key set.
SDP: The Select Data Partitions bit is not supported by the drive and if set, a CHECK CONDITION status is returned
with an ILLEGAL REQUEST Sense Key set.
IDP: The Initiator Defined Partitions bit is supported and, when set to one, indicates that the tape shall be partitioned
based on the Additional Partitions Defined field, PSUM and Partition Size field.
PSUM: The Partition Size Unit of Measured field defines the units in which the Partition Size value selects the
partition size.
Table 6-44: 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-800V 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-3 Mode, AIT-2 Turbo)
11b 1001b: 10
9
byte (AIT-3Ex Mode)
If another value is set these fields a CHECK CONDITION status is returned with an ILLEGAL REQUEST sense key
set.