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Number of Devices
One of SCSI's strengths as an interface is its support for large numbers of devices on the bus, and the fact that different "conversations" between devices can be taking place simultaneously. SCSI buses can support as many as 16 different devices; compared to the IDE/ATA interface and its limit of two, this offers significant flexibility.
There are four different issues that influence the number of devices that can be used on a single SCSI channel:
This table shows a summary of all the different transfer modes and signaling methods, and the number of devices supported for each.
Note: It's pretty unusual
in most systems to need more than 8 devices, much less 16. If this is an issue, however,
you can connect more devices either by using two host adapters in the PC, or a single host
adapter that supports multiple independent channels.
Next: SCSI Device IDs