MODE SELECT | 6.Command Specification |
6.7.5.Medium Partitions Parameter Page (11h)
The drive supports the Medium Partitions Parameter Page, which has the following format:
Table
Bit | 7 | 6 | 5 | 4 |
| 3 |
| 2 | 1 | 0 |
Byte |
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0 | PS (0) | Reserved |
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| Page Code (11h) |
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1 |
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| Page Length (0Ah) |
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2 |
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| Maximum Additional Partitions (0h) |
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3 |
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| Additional Partitions Defined (00h) |
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4 | FDP (0) | SDP (0) | IDP |
| PSUM |
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| Reserved |
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5 |
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| Medium Format Recognition (03h) |
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6 |
| Reserved |
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| Partition Units |
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7 |
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| Reserved |
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8 | (MSB) |
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| Partition Size (Partition 0) |
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9 |
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| (LSB) |
10 | (MSB) |
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| Obsolete |
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11 |
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| (LSB) |
Warning: This page is used to format a tape to one partition. Extreme care must be taken 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
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 will 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 6-48: PSUM values
Code | Description | Support |
00b | bytes (unit of one) | Not Support |
01b | kilobytes (103 bytes) | Not Support |
10b | Megabytes (106 bytes) | Support |
11b | 10 (PARTITION UNITS) bytes | Support |
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 will define the units of the partition size descriptors as 10n bytes.
PSUM | Partition Units | |
11b | 0111b | : 107 byte |
11b | 1001b | : 109 byte |
If another value is set these fields, a CHECK CONDITION status is returned with an ILLEGAL REQUEST sense key set.
SONY |