Back in October when the DSi was announced, Nintendo president Satoru Iwata revealed that the system would have flash memory much like the Wii. Now, however, we finally know how much memory the DSi supports. A recent writeup notes that the DSi has 256 megabytes of internal memory.
“The only piece of content available under the DSi Ware option at the moment is the free Opera browser. The download takes 85 blocks of your 1,024 block space. While not listed in the system’s official specs, Nintendo president Satoru Iwata said during a recent investor briefing that the internal memory consists of 256 megabytes, which is half that of the Wii.”