Oh, it will boot - and more perfect than you expect! OF is smart! In normal cases (with only built in IDE) it creates at runtime the hd: device, which points on first bootable partition, found on IDE port. hd is the device-alias for full hardware-path to that device. In my case I use a bootmenue, which points for booting only to device-alias-name hd: (not to the full hardwarepath). If there is an SCSI-Card with HD, ZIP,etc. inserted, OF takes this as first bootable path and points hd to the first bootable device on SCSI-BUS. In my case boot command boot hd:0 boot.img BD=<your Sys-partition> boots from SCSI when available, or if not, from built-in IDE.