No, it identifies the physical device, which can have several logical devices embedded in it.
The SCSI logical unit number for boot devices is almost always zero(0).Matt Friend
Assign each SCSI device a unique ID number
011
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.
It connects eternal device, connects power supply to analyze data.-Small computer system interface.-for peripheral devices connectivity (8 devices (0-7))-Internal and external buses like power supply and extensive peripherals.-Ultra SCSI - 32 devices (no wire is required, all with is uses is wireless).-Physical drive accession - (Single hard dish is physical drive).-Logical drive accession.-SCSI ID is available in the device.Configuration done in booting.-5MB/Sec.-SCSI: 2--Fast SCSI - 10MB/Sec.--Wide SCSI - 16bit 20MB/Sec.-SCSI: 3--Support 32 device - 40MB/Sec.Note: the above answer is in the form of points.
ID 3
id 2
The host adapter is assigned SCSI ID 7, which has the highest priority over all other devices.
The ID number which is traditionally assigned to the SCSI controller is ID 7. ID 7 is given the highest priority during bus arbitration.
It connects eternal device, connects power supply to analyze data.-Small computer system interface.-for peripheral devices connectivity (8 devices (0-7))-Internal and external buses like power supply and extensive peripherals.-Ultra SCSI - 32 devices (no wire is required, all with is uses is wireless).-Physical drive accession - (Single hard dish is physical drive).-Logical drive accession.-SCSI ID is available in the device.Configuration done in booting.-5MB/Sec.-SCSI: 2--Fast SCSI - 10MB/Sec.--Wide SCSI - 16bit 20MB/Sec.-SCSI: 3--Support 32 device - 40MB/Sec.Note: the above answer is in the form of points.
http://msdn.microsoft.com/en-us/library/cc238878.aspxdevice instance ID: A system(your operating system)-supplied device identification string that uniquely identifies a device in the system. A device instance ID is persistent across system boots.