LOAD/UNLOAD
Table 12. LOAD/UNLOAD Command |
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| 7 | 6 | 5 |
| 4 |
| 3 |
| 2 | 1 | 0 |
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0 |
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| Operation Code (1Bh) |
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1 | Logical Unit Number (0) |
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| Reserved |
| Immed | ||||
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2 |
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| Reserved |
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3 |
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| Reserved |
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4 |
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| Reserved |
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| EOT(0) | Reten(0) | Load |
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5 |
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| Control |
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| If the Load flag is set and there is a tape in the drive, it is positioned to BOM. If the |
| Load flag is set and there is no tape in the drive, Check Condition status is |
| returned. The Sense Key is set to Not Ready (2) and the ASC/ASCQ is set to |
| Parameter Medium Not Present (3A00). |
| If the Load flag is clear, there is a tape in the drive, and medium removal prevention |
| has not been set, then the tape is unloaded and ejected. If the Load flag is clear, |
| there is a tape in the drive, and medium removal prevention has been set, then |
| Check Condition status is returned. The Sense Key is set to Illegal Request (5) and |
| the ASC/ASCQ is set to Medium Removal Prevented (5302). |
If the Load flag is clear and the tape is in the ejected position, the command is | |
presented with Check Condition status and associated sense data of 2/0402 (Not | |
Ready, Initialization Required). If the Load flag is clear and there is no cartridge | |
present, the command is presented with Check Condition status and associated | |
data of 2/3A00 (Not Ready, Medium Not Present). | |
| If the Immediate (Immed) flag is set to 1, then the drive validates the command and |
| waits for any previous command from any server to complete, including any |
| immediate commands that are currently being processed. It also waits for any |
| buffered data to be flushed to tape. It then reports a deferred error for any |
| preceding command or buffered data, if appropriate. If there is no deferred error, |
| the drive reports Good status and initiates the command. If the Immediate (Immed) |
| flag is set to 0, status is not returned until after the command has completed. |
| The End Of Tape (EOT) and Retension (Reten) flags are not supported and should |
| be set to 0. |
14Ultrium Internal Tape Drive and 3580 Ultrium Tape Drive: SCSI Reference
