Thanks for all the advice on setting up software RAID with SATA drives - especially to Morten Tormoen for the information on speeding up the re-sync. I have now had time to go back to the machine and start again: I now have one 300GB SATA drive on the motherboard controller and one on the PCI card and they're currently re-syncing at 48445K/Sec and will be done in 90 mins - a big improvement on 250kB/sec!!! Nigel Kendrick