When it comes to the actual flashing of the 360 drive you need to have raid disabled
Also I dont have any hard drives or rom drives connected... I pull both the sata hard drive and the ide drives cables from the mobo and boot from a usb stick using iprep.
Just copied this from the tut incase it was missed ....
VIA SATA
Just some notes about users of VIA SATA chipsets. This is for both onboard chipsets (like the 8237) as well as the PCI cards (6421).
A common problem is detecting the drive with MTKFlash with VIA chipsets. For some reason, many people have this problem when using the external ports on the VIA SATA cards, or the “1” port if using internal. What seems to work best for most people is always using the primary “0” SATA port. On the PCI SATA cards, this is almost always an internal port. If there are multiple internal ports, use the port closest to the front of your PC.
Also, the latest VIA SATA drivers are available... When you run through the installation wizard, uncheck (don’t install) the VIA RAID Tool. Just install the drivers.
Hope this helps Chookey