Compaq AlphaServer GS60 Operation Manual page 265

SCSI controller information — Describes the physical characteristics of the
selected SCSI controller. This line includes:
Controller — Brand and model of SCSI chip used on the SCSI controller.
Controller number — Based on the number of SCSI controllers of a particular type
in the system. The first controller of a type is always numbered 0.
SCSI ID number — A unique number assigned to the SCSI controller. The
standard controller numbering scheme is for controllers to be SCSI ID 7.
SCSI bus number — Indicates if the controller is first or second in the system. The
first controller is tied to SCSI bus 0, and the second to SCSI bus 1.
SCSI ID — A unique number you assign to each SCSI device in the system. This
is usually done with jumpers or a thumb wheel attached to the drive housing.
Device type — Displays whether the device is a hard disk, CD-ROM, scanner, or
other type of device.
Size — The raw capacity of the drive. Formatting the drive with different file
systems (for example, FAT and NTFS) may result in different usable sizes
because of differences in the way those file systems manage storage. This is left
blank if it is not applicable to a device (for example, a scanner).
Description — The name and model of the device as recorded in the device's
firmware.
AlphaBIOS Firmware 8-23