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An example of a game card, the Metroid Prime Hunters game card

Nintendo DS games use a proprietary solid state mask ROM in their game cards. The mask ROM chips are manufactured by Macronix and have an access time of 150 ns.Cards currently range from 64 Mb to 4 Gbs (8–512 MB) in size (although data on the maximum capacity has not been released).

Larger cards have a 25% slower data transfer rate than more common smaller cards. The cards usually have a small amount of flash memory or an EEPROM to save user data such as game progress or high scores. However, there are few games that have no save memory such as Electroplankton. The game cards are 35×33×3.8 mm (1.4×1.3×0.15 in) (about half the width and depth of Game Boy Advance cartridges) and weigh around 3.5 g (1⁄8 oz).

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