I am running out of hair to pull out here. Installing Windows 7 RC on my box (MSI K9A2VM-FD mobo) with a raid 0 setup. Using onboard "fakeraid" AMD sb700 chipset. I have setup the two drives in the raid manager (1 seagate 250 and 1 seagate 160) to be a part of the array. I end up with a usable 320 GB due to the size differences. Both drives are tested and work fine. When installing windows 7, if I use "advanced" mode, or let it try itself, it fails with the generic Failed to format partition, error code 0x80070057. I can see the partitions with or without the amd driver. Things I have tried from searching here and elsewhere: I have tried it with one stick of memory I have the "recognized" (when loading drivers in the setup screen) amd drivers for the sb700 on a thumbdrive. I have tried deleting the 100MB recovery partition. I am at wit's end. I only am reinstalling the OS to have a RAID0 drive. Already had a working install prior to today. :\ No amount of effort will get past this error so far.