A SCSI ID is a unique identifier assigned to each SCSI device on the bus. It determines the SCSI device's priority. There are 16 IDs, ranging from 0 to 15. The order of the priorities is a bit unusual. From highest priority to lowest they are: 7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12 ,11, 10, 9, 8. ID 7 is almost always reserved for the SCSI Host Adapter. The other IDs are free to be assigned as desired, although your computer may have assigned them automatically.
Never assign the same ID to more than one device.
A standard SCSI controller can handle up to 7 devices per channel. Each device on this channel must be given a SCSI ID number (1 through 7 in this case) to avoid conflicting with the other devices. This is usually done with jumpers, but may also be done with toggle switches, or even through software.
id 2
The ID number which is traditionally assigned to the SCSI controller is ID 7. ID 7 is given the highest priority during bus arbitration.
Assign each SCSI device a unique ID number
ID3. Every other device can be set to any number as long as it's not in use. It is a recommended practice in IT comunity to set the scsi ID number for CD-ROM drive to 3.
ID 3
The host adapter is assigned SCSI ID 7, which has the highest priority over all other devices.
The SCSI logical unit number for boot devices is almost always zero(0).Matt Friend
You change the ID of one of them. You change the ID of one of them.
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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.
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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.