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The WRITE BUFFER command is used with READ BUFFER as a diagnostic
function for testing the device data buffer, DMA engine, SCSI bus interface
hardware, and SCSI bus integrity. It is also used for downloading and updating
DLTtape microcode (firmware).
Bit
Byte
76543210
0 Operation Code (3Bh)
1 Logical Unit Number Reserved Mode
2 Buffer ID (00h)
3 – 5
(MSB)
Buffer Offset
(LSB)
6 – 8
(MSB)
Parameter List / Data Length
(LSB)
9 Unused Reserved Flag Link
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Mode The tape drive supports the following values within the field. If any
other value is set, the drive terminates the command with CHECK
CONDITION status and an ILLEGAL REQUEST sense key set.
Mode Description
000b WRITE combined header and data (Section 5.32.1)
010b WRITE data (Section 5.32.2)
100b Download Microcode (Section 5.32.3)
101b Download Microcode and Save (Section 5.32.4)
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