Long Block Form ID
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| 7 | 6 | 5 | 4 | 3 | 2 |
| 1 | 0 |
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| 0 | BOP | EOP | Reserved (0) | MPU | LONU (0) |
| Reserved (0) |
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| 1 |
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| Reserved (0) |
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| 3 |
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| 4 | (MSB) |
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| Partition Number (0) |
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| 7 |
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| 8 | (MSB) |
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| Block Number |
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| 15 |
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| 16 | (MSB) |
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| File Number |
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| 23 |
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| 24 | (MSB) |
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| Set Number(0) |
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| 31 |
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Returned data fields: |
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| MPU |
| Mark Position Unknown |
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| 0 The File Number and Set Number fields are valid. |
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| LONU |
| 0 The Partition Number and Block Number are valid. |
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| Partition Number | This will always be zero because Ultrium drives do not support multiple partitions. |
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| Block Number | The number of logical blocks between BOP (beginning of partition) and the current |
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| logical position. Filemarks count as one logical block each. |
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| File Number | The number of filemarks between BOP and the current logical position. |
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| Set Number | The number of setmarks between BOP and the current logical position. |
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READ POSITION 34h 129