I get my scarlet, so upgrade my I7 based edit suit, preimier CS5.5 goto 18GB of ram and a GTX870 for the cuda and put on windows 7 nice clean sweep format C drive and create a new internal raid array and reinstall drivers.
Great, untill it takes an hour to tranfer 14 GB (Thats about 4MB/s) from a portable hardrive on to my 4 disk raid 5 array. So test Iest Portable hardrive to portable hard drive via USB the same slow result, copying from the raid array to the program disk, about twice that (8MB/s).
This was not the case before, even with the cardinal sin of Vista I was get over five times the USB performance and the Raid perfomance was fine.
unsurprisingly CS5.5 thinks it should be fine for play back but just grinds to a halt.