16 devices can be connected
8 Devices can be used on a single SCSI bus.
SCSI, Fast SCSI, Ultra SCSI, Ultra2 SCSI: 8 devices Wide SCSI, Fast Wide SCSI, Ultra Wide SCSI, Wide Ultra2 SCSI, Ultra3 SCSI, Ultra160 and 160+ and Ultra320 : 16 devices Of course, the number of devices supported depends not only on protocol limitations, but cable length, number of cables used, etc.
Wide SCSI bus can support up to 16 devices using channels 0-15.
Most modern SCSI buses support a total of 16 devices, while older SCSI implementations usually support only eight devices.
8
Depends on what the SCSI is. Ultra? Ultra Wide? Ultra Wide 2? many different types.
Typically the narrow scan cable has 50 pins.
8 or 16 depending upon the SCSI hardware being used. In a narrow bus, you can use a SCSI ID of 0-7, and in a wide bus, you can use 0-15.
The beauty of SCSI is that supports many physical interfaces. Fibre channel SCSI uses 4 "pins" which can be copper, or fibre optic cabling. Parallel scsi which you are probably asking about can use 25, 50 or 68 pins. So you should rephrase your question to specify the interface you are asking about ... but I guess that would liook kinda dumb, ... "How many pins does a 50-pin SCSI interface have" :)
Scsi has nothing to do with disk partition.
I am assuming you mean what is SCSI used for? In this case, SCSI does NOT mean "small computer serial interface," instead, it means "Small Computer SYSTEM Interface." SCSI is used as a fast interface between a host adapter and the CPU that can daisy chain as many as 7 or 15 devices on a single bus.