you can download the action replay software and hack it to use any kind of memory card, even 3rd party. download a free microsoft application called USBVIEW (google it) and then hook your USB to memory card adapter (with the memory card already attached) into your computer (gameshark or action replay will work)
Then open the usbview app and look for your memory card (it may be named something like "USB mass storage device" or along the lines).
As you can see, i've already changed my 3rd party mad catz memory so it will work with action replay. What you do next is click on the xbox memory card device on the left side of the screen and look at the right side of the screen. copy the "idVendor" and the "idProduct" codes WITHOUT THE 0x (meaning you would copy just the (0E4C and the 044B) then close USBVIEW. Next go to your "drivers" folder inside the action replay software folder on your computer (here's the most used path
C/program files/Datel/ActionReplay Xbox/drivers)
and then open up the xbreader file in notepad and you'll see the following information:
just copy a line that starts with %S_Device... and paste it at the bottom of the same list. then take the 2 codes you copied from USBVIEW and paste them in the VID_ and PID_ areas (you can see from my pic that i pasted the 0E4C and 044B in the 2nd to the last line. save the text document and then open up action replay. if everything was done correctly your memory card will appear and you can then back up anything!!!
NOTE: this is the same method you would use to make a USB thumbdrive work with your xbox. but you have to make sure you use a thumbdrive that is compatible with the xbox, or the xbox (and action replay) won't see it. Just order a USB to memory card adapter from microsoft (go to xbox.com and search "PSO Keyboard".
You will be able to order an adapter for free (+6 bucks shipping) and then you hook the thumbdrive into one end and the memory card end to the action replay or gameshark adapter and repeat the above instructions! (the PNY thumbdrive pictures DOES NOT work with the xbox. i heard sandisk thumbdrives work well using this method and people have used any size from 16mb to 512mb) good luck!
Sorry this took so long to post, i'm on 56k and uploadint the pictures was a bitch!
jshorr: that gameshark device is what i used to hook my 3rd party memory cards to my computer, then used action replay and the above hack to get the whole system to work. i'm in the process of figuring out how to use the "Mega X Key" software to format my USB thumbdrive so it will work with the xbox.
for me this whole thing started when my xbox crapped out on me. i can turn it on and get to the dashboard, but after about 15 minutes of the xbox turned on, the screen goes to the "your xbox needs service" and my light blinks red and green. and i'll be damned if i'm gonna lose all of my game saves, so i've been transfering them to my computer until i get a new xbox.