HP 220mx HP SureStore 9100mx Optical Disk Drive User's Guide - Page 59
LUN Addressing, Transfer Rates on the Bus
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Operating This Drive on a SCSI Bus A Brief Overview of SCSI an ID greater than 7, would always assume it won the contention and would attempt to talk, perhaps at the same time as a device with an ID above 7 that was contending for the bus. The following diagram shows the priority scale of IDs when the priority of the two blocks of eight are reversed. Priority 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7 Narrow Addresses Wide Address Range The diagram below shows the linear addressing of a simple, narrow bus with the host adapter set at a SCSI ID of 7. The device ID does not determine where the device is physically placed on the bus. Operating the Drive on a SCSI Bus LUN Addressing This drive does not support logical unit numbering (LUN) addressing Transfer Rates on the Bus Initially, the SCSI specification defined a 5 MB/s synchronous data transfer rate on the narrow bus. SCSI now also defines "Fast" which is 10 MB/s on a narrow bus and 20 MB/s on a wide bus. Another definition is "Ultra," also known as "Fast-20" which is 20 MB/s transfer rate on a narrow bus and 40 MB/s on a wide bus. Appendix B B- 3