N-Tools was written by antivoid and digitalfire, and was made to fix corrupt MMCs. It allows you to make "backup images" of your MMC, or write these images back to your MMC - writing a working image, to a corrupt MMC, will fix most errors.
If Windows does not detect your phone (should show an icon in the system tray), you wont be able to use software to fix your MMC, though you can *technically* use this program to fix your MMC, by using a memory card reader.
N-Tools v0.75 (Beta) - 316kb
A working "formatted" 32mb MMC image - 32kb
A working new 32mb MMC image - 32kb
A working new 128mb MMC image - 128kb
A working new 256mb MMC image - 256kb