| READ ATTRIBUTE | 8Ch |
The READ ATTRIBUTE command allows an application client to read attribute values to MAM (Medium Auxiliary Memory). It should be executed before sending a WRITE ATTRIBUTE command.
Illegal Field | Deferred Error | Unit Attention | Media Access |
In order to execute a READ ATTRIBUTE command, there must be a cartridge in the drive, even if it is only partially loaded, so that the MAM can be read.
Command descriptor block:
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| 3 | 2 | 1 | 0 |
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| 0 |
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| Operation | Code (8Ch) |
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| 1 |
| Reserved (0) |
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| Service Action |
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| 2 |
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| Reserved (0) |
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| 4 |
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| 5 |
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| Volume Number (0) |
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| 6 |
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| 7 |
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| Partition Number (0) |
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| 8 | (MSB) |
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| First Attribute ID |
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| 9 |
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| 10 | (MSB) |
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| Allocation Length |
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| 13 |
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| 14 |
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| Reserved (0) |
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| 15 |
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| Control |
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CDB fields:
Service Action Service actions are defined as follows. The data returned for each Service Action is described below.
Code | Name | Description |
00h | Attribute Values | Returns the attribute values. |
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01h | Attribute List | Returns a list of attribute IDs that are available (both |
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| supported and existing IDs) |
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02h | Volume List | Returns a list of known volume numbers. For Ultrium |
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| drives, there is only a single volume, Volume 0. |
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03h | Partition List | Returns a list of known partition numbers. For Ultrium |
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| drives, there is only a single partition, Partition 0. |
Commands
READ ATTRIBUTE 8Ch 111