Yep
I just flashed by DVD MS28 with Xtreme 4.2A using a VIA 2641A PCI CARD ($10 from Ebay)
I used Xtreme bootmaker and SAM360
1) First disconnect everything IDE and SATA from your PC
2) Connect XBOXDVD drive to the SATA1 (PRIMARY), on the PCI CARD thats connector on the side of the PCI, it is facing the front of the PC.
3) Power on PC and boot using Floppy / USB Disk made for Xtreme bootmaker
4) Power on XBOX360
5) Type 'SAMREAD XXXXXXX XXXXX' (where x is your serial number) and press 'ENTER'
6) A menu appears, Select the channel of the XBOX and power off XBOX360
7) Awaiting 10 sec

Power on XBOX360
9) Read firmware its loops 3-4 times before the process completes
10) Poweroff for XBOX
11) Type 'SAMHACK XXXXXXX XXXXX' (where x is your serial number) and press 'ENTER' repeat steps 6
- 10
It have tried for many guides and different combination of SATA controllers. Only this has work for me.
This method worked for me as well but my orignal xbox backups do not work in the 360 drive with hacked firmware. The process for backing up a orignal 360 game looks to be a royal pain since you have to remove the cover of a dvd-rom drive, I will definately NOT be attempting that and possiably ruining a perfectly good drive. Can you use the xbox 360 dvd-rom drive to read the discs? If so, a link to a tutorial would be very much appreciated! Thanks for the easiest mod I have ever done to a console. The steps listed above worked perfectly without disabling anything in the bios or unplugging any cables.