http://www.r4cards.co.nz - The R4 DS simply represent the latest in the development of flash based memory cards for the DS. The two maps are normally the same and differ only in name, when using microSD memory cards and taken into Slot 1 (DS game slot). Its has the ability tio drag and drop ROM and Homebrew (meaning no fiddly patching of files, you literally just copy the files to your micro SD card) and have an easy to use interface with Moon shell built in as default for play MP3 files and video files.