| WRITE BUFFER | 3Bh |
Write Buffer is used to transfer data into memory on the drive for the purposes of diagnostics, tests or firmware upgrade. The data is placed into one of the drive buffers depending on the Mode and Buffer ID fields of the command.
CAUTION: Do not attempt to use the buffer modifying functions of this command unless you really know what you are doing. The buffer modifying functions are intended as a diagnostic aid to be used in conjunction with the Read Buffer command. It is not possible to modify data in the buffer so that it subsequently written to media because all host data is flushed before executing the command.
The firmware download functions are intended for use by manufacturing and by customers using upgrade utilities supplied by HP.
Illegal Field Reservation Deferred Error Unit Attention
Command descriptor block:
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| 6 | 5 | 4 |
| 3 | 2 | 1 | 0 |
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| 0 |
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| Operation | Code (3Bh) |
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| 1 |
| Reserved (0) |
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| Mode |
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| 2 |
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| Buffer ID |
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| 3 |
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| Buffer Offset |
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| 5 |
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| 6 |
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| Parameter List Length |
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| 8 |
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| 9 |
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| Control |
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CDB fields:
Mode | This field can be set to one of the following values: |
| 00h The drive transfers a |
| followed by (allocation length − 4) bytes of data. The data is written into the |
| buffer identified by the Buffer ID, starting from offset zero in the buffer. |
| The Buffer ID and Buffer Offset must both be zero. Allocation Length must not |
| exceed (buffer size + 4). |
| 02h The drive transfers allocation length bytes of data from the host, bytes of data |
| which is placed in the buffer indicated by Buffer ID, starting from Buffer Offset |
| from the start of the buffer. No header is sent. |
| The Buffer Offset and Allocation Length must be kept within the buffer size, and |
| the Buffer ID must to set to one of the valid values. |
Commands
WRITE BUFFER 3Bh 183