The drive's logical unit number (LUN) is shown here. The LUN is an additional identification of the drive to the computer. If the drive is a SCSI device, its SCSI ID is shown here. The identification number of the bus the drive is on is shown here. The bus type (SCSI or IDE/ATA) is shown here. Click an item in this list to select it. To initialize an item, click this button. Not available because nothing is selected in the List of Drives, or the item selected cannot be initialized by Drive Setup. To initialize the selected item, click this button. When testing the drive, click this button to stop testing.