I'm having an extremely similar error.
Using:
MS-28 (original firmware)
VIA 6241A
Bootdisk maker's edited MTKFlash and downloaded MTKVia
trying to load Xtreme 5.1D
ASUS P5B-Dlx Mobo with C2D
On every attempt I am getting MTK to find the Via primary drive.
If the Xbox is on before the PC the via bios screen hangs on detecting drive, then eventually fails that. Proceeds to boot.
I can load MTK just fine, If I hit escape I am getting 51 should be 70. (Need 80)
If I turn the xbox off, hit the MTK menu item, and then wait 10s, turn box back on the correct SST chip is found then it hangs at "Reading..... 00%". Never any progress.
Have tired with and without /SATA, tried SAMREAD, etc etc, have NO IDEA whats going on here!
QUOTE(Jer4251 @ Dec 29 2006, 08:33 AM)

thanks for clearin that up for me. do i absolutley have to add /sata to both files?
From what I understand /sata works for some people and is not required for others. Might as well try both.