Mode Data Format
Mode data returned by a MODE SENSE command or sent with a MODE SELECT command consists of a Mode Parameter Header, an optional Mode Block Descriptor, and zero or more Mode Parameter Pages.
Table 30. Mode Data Format
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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0
: | Mode Parameter Header |
3
4
: | Mode Block Descriptor |
11
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Mode Parameter Pages
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Mode Parameter Header
Table 31. Mode Parameter Header 6-Byte Command
| 7 | 6 |
| 5 |
| 4 |
| 3 |
| 2 | 1 | 0 |
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0 |
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| Mode Data Length |
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1 |
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| Medium Type (0) |
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2 | WP |
| Buffered Mode |
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| Speed (0) |
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3 |
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| Block Descriptor Length |
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Table 32. Mode Parameter Header |
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| 7 | 6 |
| 5 |
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| 3 |
| 2 | 1 | 0 |
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0 |
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| Mode Data Length |
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1 |
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2 |
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| Medium Type (0) |
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3 | WP |
| Buffered Mode |
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| Speed (0) |
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4 |
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| Reserved |
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5 |
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| Reserved |
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6 |
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| Block Descriptor Length |
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7 |
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In a MODE SENSE command, the Mode Data Length indicates the total amount of data available to be transferred. In a MODE SELECT command, this field is 0.
The Medium Type field is not used and should be set to 0.
The Write Protect flag indicates whether the currently loaded tape is write protected in a MODE SENSE command. It is ignored in a MODE SELECT command.
28Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference
