Correction for the size of a Secure Digital (SD) card
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How big is 0.0004 square meters?
It's about half as big as a Secure Digital (SD) card
The size of a Secure Digital (SD) card is about 0.00077 square meters.
A Secure Digital (SD) card measures 3.2 cm by 2.4 cm for a total area of 0.00077 square meters. SDXC Cards, the latest standard for the technology, will allow the cards to hold up to 2 terabytes of data.