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MODE SELSECT
Partition Sizes: This field allows the initiator to allocate the capacity of 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. 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.
If the Additional Partitions Defined and Partition Size fields are set to ZERO the drive will initialize the tape as
partition 0, and create a single partitioned tape.
The size of partition 0 is only valid during Mode Sense and is ignored during Mode Select. For Mode Select only
partition 1 size is used when Additional Partitions Defined field is set to 01h. Partition 0 size is ignored. Internally, the
drive computes partition 0 size to be the remaining capacity of the tape. This remaining capacity is the maximum
uncompressed capacity minus partition 1 size.
A second way to issue Mode Select Page 11h is to set Page Length to 08h, and set bytes 8 and 9 to partition 1 size.
In this method partition 0 size is not sent, but this size is still computed as defined above. In either case, Mode Sense
will report partition 0 and partition 1 sizes.
6.7.5. Medium Partitions Parameter Page (for multi-partitioned tapes) (11h)
The Medium Partitions Parameter Page supported by the drive has the following format:
Table 6-40: Medium Partitions Parameter Page(for multi-partitioned tapes)
Bit
7
Byte
0
PS (0)
1
2
3
4
FDP (0)
5
6
7
8
(MSB)
9
10
(MSB)
11
134
(MSB)
135
Warning: This page is used to format a tape to with one or two partitions. Extreme care must be used with this
parameter page to avoid accidental reformatting of the tape. Reformatting will destroy all existing data.
Maximum Additional Partitions: This field is only valid for MODE SENSE, and it is used to report the maximum
number of additional partitions. This field is non-changeable; however it accepts all values as a don't care. The field
value represents the maximum number of additional partitions supported, and it is limited by the free memory
available in MIC, as well as the AIT Format limit of 256 partitions. SDX-550V calculates how many partitions can be
created for the current SDX1-25C media; for example, you can make up to 14 partitions with net total 13 bytes of the
User Volume Note and User Partition Notes when using 2Kbytes version of SDX1-25C.
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. The
drive the CHECK CONDITION status (ASC/ASCQ=83h/80h), when there is not enough room in the MIC.
SONY AIT-2 Turbo drive SDX-550V series Ver.1.0
6
5
Reserved
Maximum Additional Partitions
Additional Partitions Defined
SDP (0)
IDP (1)
Medium Format Recognition (03h)
Partition Size (Partition 0)
Partition Size (Partition 1)
Partition Size (Physical & Logical Partition 63)
4
3
Page Code (11h)
Page Length (08h-88h)
PSUM (10b)
Reserved
Reserved
:
:
:
6.Command Specification
2
1
Reserved
(LSB)
(LSB)
(LSB)
0
6-47
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