The Wii memory card contains 512 megabytes of internal flash memory and also features an SD card slot for external storage. An SD card in turn can be used for uploading photos as well as backing up saved game data and downloaded Virtual Console as well as Wii Ware games. To use an SD slot for transferring saved games, an update should be installed. The installation can be started from the Wii options menu through an Internet connection, or simply by inserting a game disc containing the update.
Virtual Console data can not be restored to any system except for the unit of origin. An SD card can also be used to create customized in-game music from stored MP3 files, as first shown in Excite Truck, and music for the slideshow feature of the Photo Channel. Version 1.1 of the Photo Channel removed MP3 playback in favor of AAC support.
At the Nintendo Fall Press Conference in October 2008, Satoru Iwata announced that Wii owners would offer the option to download WiiWare and Virtual Console content directly onto an SD card. They also announced that it would be available in Japan in the spring of 2009. Nintendo made these update available since March 25, 2009. In addition to the previously announced functionality, it lets the player load Virtual Console and WiiWare games directly from an SD card. This update allows the use of SDHC card, which increases the limit on SD card size from 2GB to 32GB.