Hello, I installed a RAID 1 array (mirror) on my dual-boot (GRUB bootloader) system. The array comprises the existing 80 GB disk, plus an additional SATA 120 GB disk. Installed RAID controller is the Promise FastTrak 376 Controller. In the Windows Device Manager, under 'disk drives', two drives are listed: Promise 1x2 Mirrir/RAID 1 SCSI Disk Device WDC WD800JB-00CRA1 During POST, the following message appears: FastTrak 376(tm) BIOS Version 1.00.0.21 (c) 2002-2005 Promise Tech., blah blah ID: 1*, Mode: 1x2 Mirror, Size: 80026 M, Track-Mapping 9729/255/63, Status: Functional POST ends with the following message: disk boot failure, insert system disk and press enter When I switch off the machine, and reconnect the 80 GB disk from the parallel RAID connector to its customary IDE connector, the machine enters the GRUB bootloader in the normal way. It then also becomes clear that during the creation of the RAID array the 80 GB disk has indeed been copied to the 120 GB disk. Why does it not want to boot ?? Thanks in advance, Rob

I do not have the same controller as you, but, as I recall, there was an option where I had to tell the RAID controller that I wanted to boot from the array.