SUCCESS!! finally jeez!! I now know why people write their own tutorials everytime they flash this MS28 drive!! it feels like you overcame a huge obsiticle!!
My setup and it goes with the person who started this thread!
Asus p4p800se on board ICH5 chipset!!
In the long run after sooooo many trial and errors I actually disconnected ALL drive except floppy from pc.
With this board and setup the drive MUST be seen by the bios before proceeding... for this to happen with the vcc trick the wires MUST be connected first!!!
if the wires are not connected the drive is not seen in bios and for me durring this process it would not work unless that happened.
the pc CANNOT be turned on first! the xbox MUST be turned on first then the PC
otherwise bios just sits there trying to see the drive.
With me the drives center led constantly blinks when wires are disconnected. some people say theirs does not blink when disconnected .. I dunno but mine does! or did that is

ok here we go. the time in this is critical!! also the steps you take are also critical they must be followed to the t for this motherboard setup. at least it was with me.
I know this is sounding familiar to alot of you!
I also installed a switch on the wires because it makes the process much easier to deal with also less likely to short out on the case if you make the wires long enough for that not to happen.!!! this will hurt you drive if you short one of those wires.
1. wires must be connected on dvd drive.. sata connected power connected.
2. turn on xbox...
3. turn on pc... with mtkflash (no need for editing mtkflash for this chipset!!) on floppy (for me anyway)
4. bios sees drive when wires connected!
5. computer is now at dos prompt
6. before anything else turn xbox OFF NOT PC leave that alone.
7. disconnect wires (switch open)
8. type mtkflash r /m ms28.bin DO NOT HIT ENTER YET!
9. this is the critical timing thing. for this board or me it was 2.0 - 3.5 seconds and thats about it!!
probably closer to 2.0 seconds ...2.2 whatever you will see it seems to be that picky for sure!!!
10. now you are ready... turn on xbox... then 2.5 seconds later press enter on keyboard.
11. IF timed correctly mtkflash will ask for which number .. master/slave etc..etc.
IF mtkflash says drive not found.. you did not time it correctly.. period! yes my center led is flashing this whole time. try try try try a million times again you will get it... no longer than 4 seconds for sure.. no faster than 2 I would say.
11.5 - if it says drive not found.. just turn off xbox... leaving wires disconnected..
type in mtkflash r /m ms28.bin do not hit enter!! turn on xbox 2.2-3.5 seconds press enter on pc
again drive not found repeat this process until it is.
12. IF you ever time it right and get it to the part where mtkflash says 1, 2, etc etc..
CONNECT WIRES NOW... then press corresponding number for your drive!!
you should see it start reading!!
DONE! and yes it loops like 4 times to 100% leave it be. until finished.
I heard of people or one person stating his froze while reading .. I would say maybe it was his floppy drive or floppy disk itself. make sure there is enough room on it.. and try it again.
I used toolbox 1.0 to get the key ... flash a MS25 drive with this key and put it on the ms28 motherboard worked great!
hope this helps someone.