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.
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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
ID 3
The SCSI logical unit number for boot devices is almost always zero(0).Matt Friend
The host adapter is assigned SCSI ID 7, which has the highest priority over all other devices.
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 - Small Computer System InterfaceSCSI is an industry standard system interface, which allows multiple peripheral devices to be installed on the system. The number of devices that can be installed depends on the type of SCSI Host adapter that you have installed in your system. Most SCSI systems have an older "Narrow" 8-bit SCSI host adapter, which have 8-bit data paths and allow for up to 7 devices to be installed on the same channel. Newer "Wide" Host adapters have 16-bit wide data paths and provide support for up to 15 devices. 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.
0 is highest, 15 is lowest. The highest-priority ID on the SCSI bus is 7. You normally assign this ID to the host adapter. Next in priority, from highest to lowest, are IDs 6-0 and then 15-8. So 0 has higher priority than 15.