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compared to IDE and other buses, SCSI has the capability to 'disconnect' devices while they are working, thus freeing the bus for other devices.
So you can have up to 8 devices on a SCSI bus (OK, one typically is the controller); each time your system needs some data from a device, the controller sends the command to the device, then disconnects.
When the device has collected the data, it alerts back the controller, requesting the bus, and sending back the retrieved data.
In the meanwhile (after the command is sent, and before the answer is returned) the controller can handle other requests and answers from and to other devices on the same bus.
So SCSI is much more efficient than IDE, but only if you connect more than one device, and the more devices connect the more it is efficient (provided that you distribute your data in order to request accesses to more than one device, obviously!)
On the other hand, SCSI is more complex, so it is more expensive.
What else can I help you with?
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