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Narrow SCSI hardware cannot "see" over 7, so if you connect narrow devices to a wide adapter, the other 8 bits will have to be terminated.
M-Systems offers a complete line of solid-state flash disk products in 2.5-inch IDE, 2.5-inch Narrow SCSI, 3.5-inch Narrow SCSI, and 3.5-inch Ultra-Wide SCSI form factors.
Figure 1 illustrates the most common flash disk form factors: 2.5" (for laptops) with IDE/ATA and narrow SCSI interfaces, and 3.5" (for desktops) with narrow and wide SCSI interlaces.
Fast SCSI (up to 10 Megatransfers per second, which is 10MB/sec for narrow SCSI or 20MB/sec for wide SCSI) is defined in the SCSI-2 specifications.
I have a differential SCSI hard drive, an UltraSCSI hard drive, and a narrow SCSI hard drive.
If you have a narrow SCSI host adapter (8-bit, with 50-pin SCSI connector) you can connect up to eight devices.
On a Narrow SCSI bus, you can only use 07 through 00.
Q: When I connect wide SCSI to narrow SCSI, should I use the high eight bits or the low eight bits?
While the Fast SCSI bus is capable of 10MB/sec for narrow SCSI (20MB/sec for wide SCSI), actual throughput is dependent on many factors.