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Is 251.90 square millimeters as big as a Secure Digital (SD) card?

It's about one-third as big as a Secure Digital (SD) card
The size of a Secure Digital (SD) card is about 770 square millimeters.
A Secure Digital (SD) card measures 3.2 cm by 2.4 cm for a total area of 770 square millimeters. SDXC Cards, the latest standard for the technology, will allow the cards to hold up to 2 terabytes of data.
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