OK. The raid array has four partitions. Seen as CDEF by win2k. There's an optical seen as G, the pull out ide as H and another optical seen as I. 2k is installed on F, with it's boot files on C. Now, XP sees the IDE pull out as C, and is installed on D (the first partition of the array). It has it's boot files on C (the pull out). So with the bios set to boot from the raid, the xp bootloader doesn't get read, the array one does and so I'm into 2k. If I changed the bios to boot from ide, I'd be in XP. Messy, and the purpose of the pull out is just backup and file transfers to another computer (miles away with no broadband) so sometimes it's not here! EDIT I'm thinking that it'll be easier to ditch the xp and start again. Can you tell me if the XP clean install (not upgrade) will create a dual boot ini?