Small Computer System Interface (SCSI) Overview
Grant,
you are right, sorry for mistaking this so easily:
I now looked it up (felt ashamed :-) and here it is
(humorously from a sun site *g*)
http://sunsolve.sun.com/handbook_pub/Devices/Disk/DISK_SCSI_Overview.html
SCSI-1
Narrow 8-Bit Data Bus
Single Ended (SE) or High Voltage Differential (HVD)
Asynchronous Transfer Rate up to 2.5Mbytes/sec
Synchronous Transfer Rate up to 5Mbytes/sec
Fast SCSI / SCSI-2
Narrow 8-Bit Data Bus
Single Ended (SE) or High Voltage Differential (HVD)
Asynchronous Transfer Rate up to 5Mbytes/sec
Synchronous Transfer Rate up to 10Mbytes/sec
Fast and Wide SCSI / SCSI-3 / SCSI-3 SPI
Narrow 8-Bit or Wide 16-Bit Data Bus
Single Ended (SE) or High Voltage Differential (HVD)
Asynchronous Transfer Rate up to 10Mbytes/sec
Synchronous Transfer Rate up to 20Mbytes/sec
(adaptec 2944 is a differential scsi pci controller)
(adaptec 2940 is not differential)
Fast-20 SCSI / Ultra SCSI
Narrow 8-Bit or Wide 16-Bit Data Bus
Single Ended (SE) or High Voltage Differential (HVD)
Asynchronous Transfer Rate up to 20Mbytes/sec
Synchronous Transfer Rate up to 40Mbytes/sec
Fast-40 SCSI / Ultra-2 SCSI / SPI-2
Narrow 8-Bit or Wide 16-Bit Data Bus
Low Voltage Differential (LVD)
Backwards compatable with Single Ended (SE)
Asynchronous Transfer Rate up to 40Mbytes/sec
Synchronous Transfer Rate up to 80Mbytes/sec
i have Adaptec 2940uw2 controllers with "normal" single ended uw2 disks
and also normal single ended wide scsi cables internally.i mistakenly thought of "ultrawide" with 40MB/s
but it is (as you stated) uw2 single ended with 40mb
Fast-80 SCSI / Ultra-3 SCSI / Ultra-160 SCSI / SPI-3
Wide 16-Bit Data Bus
Low Voltage Differential (LVD)
Backwards compatable with Single Ended (SE)
Synchronous Transfer Rate up to 160Mbytes/sec
Fast-160 SCSI / Ultra-320 SCSI / SPI-4
Wide 16-Bit Data Bus
Low Voltage Differential (LVD)
Backwards compatable with Single Ended (SE)
Synchronous Transfer Rate up to 320Mbytes/sec
thanks again for clearing this out, next time i promise not to sleep at
hardware basics school again :-)
bye,
Alex
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