C156-E097-01EN 1 - 11
1.3.2 Input-output device addressing
A unique device address (SCSI ID: #n in Figure 1.5) is assigned to each SCSI device. Input-
output devices connected to or under an SCSI device operating as a target are accessed in logical
units. A unique device address (LUN: logical unit number) is assigned to each logical unit.
An initiator specifies an SCSI ID to select an SCSI device operating as a target, then specifies an
LUN to select the input-output device connected to or under the target.
An optical disk drive is constructed with all volumes as a single logical unit. Specifiable SCSI
IDs and LUN are as follows:
• SCSI ID: #0 to #7 selectable (setting terminal or external input)
• LUN: #0 (fixed)
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