Your SCSI adapter may support multiple LUNs (Logical Unit Numbers) on a single SCSI ID.

Installing Windows NT on a hard drive that is not LUN 0 is not supported.

If you try, you will likely not see all the devices displayed and may receive:

                                 The hard disk containing the partition or free space you chose has a Logical                                 Unit Number (LUN) greater than 0, and is not assessable to your computer's                                 setup program. Setup cannot install Windows NT on this hard disk.                                 Please contact your computer or hard disk controller manufacturer for more                                 information.                                 Press ENTER to continue.