There are many valid ways, depending on whether you want to install them to internal memory (as originally intended) or from SD card (avoiding restrictions imposed by the size and title limit of the official DSi menu).
Using the Nintendo DSi, you can take pictures, play music and download games through the Nintendo DSi store. If you are camera-happy or love to purchase the latest DSiWare games, your DSi drive may be low on space. In this case, move files from your DSi to an SD card to free up space for more photos or games.
Compatible SD Cards
Before trying to move files to an SD card, check that your card is compatible with the DSi. Use standard SD cards and high-capacity (SDHC) cards that hold up to 32GB. If you have the correct adapter to fit an SD mini card into the Nintendo DSi SD slot, use miniSD and microSD cards to archive photos and games.
Moving Photos
Download DSi camera photos to an SD card for archival purposes. To save photos to the SD card, insert the SD card into the slot before you turn on your DSi. Then, turn on your DSi and click on the 'Camera' icon. Look at a photo and click 'SD-Card' on the touch screen to move the photos to the SD card.
Moving Game Files
Copy DSiWare games and save files to an SD card for backup purposes. With your DSi turned off, insert an SD card. Then, turn your DSi on and tap the 'Settings' icon. On the 'Settings' menu, tap 'Data Management,' then tap 'System Memory.' Select the file, then tap 'Copy.' Before copying data files, remember that you cannot overwrite files. If you are saving a recent version of a game, delete the old version off the SD card before attempting to copy the file.
Troubleshooting and Constraints
You can play music and sounds in .acc format from an SD card, but you cannot copy sound files or music that you originally created on the DSi to an SD card. You can move DSi camera photos to an SD card, but you cannot view external camera photos on the DSi. You cannot copy DSi cartridge save files to the SD card. You can only back up DSiWare games purchased though the DSi store. Try to use an SD card with a great deal of free space. If your card is almost full, the DSi may have problems copying files to the SD card.
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The Nintendo DS is home to commercial video games of all genres. Moreover, it provides extensive support for homebrew ROMs, which are open-source, free games designed by independent developers. However, the Nintendo DS does not possess a built-in method for accessing such ROM files. Thankfully, you can use one of many third-party accessories to play such ROMs successfully.
Acquire a flash media card. These cards allow you to play multiple file types, including videos, music and homebrew ROMs. The R4 and M3 flash cards are popular choices for such purposes. Typically, they are equipped with an external MicroSD chip and a computer card adapter. Otherwise, purchase these two items separately from your local retail store.
Insert the MicroSD chip into the computer card adapter, then connect it to a computer USB port.
Obtain the flash media card’s device drivers from its respective source. Also known as the card’s firmware, it allows homebrew ROMs and other files to be recognized by the flash card.
Launch “My Computer” from the Windows “Start” menu. Click the entry named “Removable Disk,” which represents the MicroSD chip.
Move the downloaded device drivers into the chip’s top level. Optionally, click the “File” menu, select “New Folder” and create a directory to store your ROM files. Otherwise, move all ROMs to the top level of the storage unit as well. Note that you can use the Windows standard copy-and-paste procedure.
Place the MicroSD chip into the media flash card’s built-in memory slot. Insert the flash card into your Nintendo DS. Initialize the console and select the “Games” section from the flash card’s main menu. Select the ROM of choice and press “Start” to launch it.
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