| WRITE | 0Ah |
Zero or more blocks of data are transferred from the host to tape starting at the current logical position.
It is recommended that the Buffered Mode field of the MODE SELECT Parameter is set to either 1 or 2 so that Immediate reporting is enabled; upon a write command the drive will report GOOD status once the data is successfully transferred to the data buffer (but not necessarily to tape).
Data held in the buffer is flushed to tape in the following circumstances:
•A SCSI command is received that forces a flush:
ERASE | LOAD | LOCATE | LOG SELECT | MODE SELECT | READ |
REWIND | SEND DIAGNOSTIC | SPACE | VERIFY | WRITE BUFFER |
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•Buffered mode is not enabled. If buffered mode has not been set to 1 or 2, the buffer is flushed before the command completes.
•The write delay time is exceeded. This is defined by the Write Delay field of the Device Configuration Mode Select page. If the drive is idle for longer than this (no operations that access the tape have been performed), any data in the buffer is flushed to tape.
Illegal Field | Fixed Bit | Reservation | Deferred Error |
Unit Attention | Media Access | Media Write | Diagnostic Status |
Command descriptor block:
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| 7 | 6 | 5 |
| 4 | 3 | 2 | 1 | 0 |
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| 0 |
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| Operation Code (0Ah) |
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| 1 |
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| Reserved (0) |
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| Fixed | |
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| 2 | (MSB) |
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| 3 |
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| Transfer Length |
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| 4 |
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| 5 |
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| Control |
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CDB fields:
Fixed | 0 | The Transfer Length field specifies the length of the transfer in bytes. |
| 1 | The Transfer Length field specifies the length of the transfer in blocks. The size of each |
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| block (in bytes) is determined by the current Block Length given in the Mode Select |
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| Parameter block descriptor. |
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Transfer | 0 | No data is transferred. The current logical position will be unchanged. |
Length | >0 | The amount of data to be transferred, in bytes or blocks as determined by the Fixed field. |
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178 Commands