i'm using vista rc1 x64. i initially installed this os onto my 200gb sata drive, but keopt having booting problems, namely, the missing BOOTMGR error. this was usually solved by turning the computer off and then on again (not just a restart). at worst, i would run the boot repair app on the vista disc. i also have a 80gb pata drive connected. i started to receive errors while attempting to transfer files from one disc to the other, pointing towards the fact that the sata drive did not exist (although this seems really weird now, given that the os was running from that drive) and iirc, on checking 'computer', the disk drive had disappeared. one time the problem got so bad that i decided to reinstall vista (the good thing is that i knew it would keep all my old files in 'windows.old'). while doing this, i realised that my pata drive was recognised as hd0 (or the equivalent) and i decided to just install vista onto that to get rid of the problems. so now im running vista off the pata and have never had a BOOTMGR missing error with this config. i can access files and run progs. from the sata and it appears in 'computer' and all is well, until i want to transfer files from the pata to the sata. the transfer gets interrupted and then when i look in 'computer', the sata drive is missing. while writing this, i realised that i don't think that i have checked the jumpers on the pata drive - the whole master/slave thing - (which i will do, next chance i get) however, maybe this is not relevant to this problem, and especially given that i only have these two drives attached, obviously with their own individual cables. i usually google my problems and find them, however, this one is a bit more of a pain. i have an asus p5w dh motherboard (975x) with latest bios etc. is this problem more closely related to the newness of the motherboard, the fact that i am using vista RC1 or somthing to do with the jumpers (or other). anyone else had similar problems or heard of this one? thanks in anticipation.