SCSI Primary Commands(SPC)是描述SCSI基本命令的权威文档,在这个文档的的第四章,确切的说是4.5节,名字就叫做Sense data,即这一节是专门介绍Sense Data的.
Sense data中最有意义的东西叫做sense key和sense code.这两个概念基本上确定了你这个错误究竟是什么错误。如果出现SCSI有关的错误，那么肯定得首先查询sense key，因此把起code的含义做了一个表格，方便查询
| Key | Sense Key Description |
|---|---|
| 0h | No Sense – Indicates there is no specific Sense Key information to be reported for the disc drive. This would be the case for a successful command or when the ILI bit is one. |
| 1h | Recovered Error – Indicates the last command completed successfully with some recovery action performed by the disc drive. When multiple recovered errors occur, the last error that occurred is reported by the additional sense bytes. Note: For some Mode settings, the last command may have terminated before completing. |
| 2h | Not Ready - Indicates the logical unit addressed cannot be accessed. Operator intervention may be required to correct this condition. |
| 3h | Medium Error – Indicates the command terminated with a nonrecovered error condition, probably caused by a flaw in the medium or an error in the recorded data. |
| 4h | Hardware Error – Indicates the disc drive detected a nonrecoverable hardware failure while performing the command or during a self test. This includes SCSI interface parity error, controller failure or device failure. |
| 5h | Illegal Request – Indicates an illegal parameter in the command descriptor block or in the additional parameters supplied as data for some commands (Format Unit, Mode Select, and so forth). If the disc drive detects an invalid parameter in the Command Descriptor Block, it shall terminate the command without altering the medium. If the disc drive detects an invalid parameter in the additional parameters supplied as data, the disc drive may have already altered the medium. This sense key may also indicate that an invalid IDENTIFY message was received. This could also indicate an attempt to write past the last logical block. |
| 6h | Unit Attention – Indicates the disc drive may have been reset. |
| 7h | Data Protect – Indicates that a command that reads or writes the medium was attempted on a block that is protected from this operation. The read or write operation is not performed. |
| 9h | Firmware Error – Vendor specific sense key. |
| Bh | Aborted Command - Indicates the disc drive aborted the command. The initiator may be able to recover by trying the command again. |
| Ch | Equal – Indicates a SEARCH DATA command has satisfied an equal comparison. |
| Dh | Volume Overflow – Indicates a buffered peripheral device has reached the end of medium partition and data remains in the buffer that has not been written to the medium. |
| Eh | Miscompare – Indicates that the source data did not match the data read from the medium. |