Nintendo DSi games use a proprietary solid state ROM "DS game card" format resembling the DSi memory cards used in other portable electronic devices such as digital cameras. DSi game Cards currently range from 64 Megabits to 4 Gigabits (8-512 Megabytes) in size (although the maximum capacity is unknown) The DSi game 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 a small number of games that have no save memory such as Electroplankton. The DSi game cards are 33.0 mm × 35.0 mm × 3.8 mm (about half the breadth and depth as Game Boy Advance cartridges) and weigh around 3.5 grams (1/8 oz).
Based on an IGN blog by the developer of MechAssault: Phantom War, larger (such as 128 MB) DSi game cards have a slower data transfer rate than the more common smaller (such as 64 MB)DSi game cards; however, the specific rates were not mentioned.

Product Reviews:

Date Added: 03/08/2010 by Angela Barth

This game is amazing. If you liked the first you will die of happiness playing this one. I can't wai

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This product was added to our catalog on Thursday 31 December, 2009.