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Simple answer: Since Memory Sticks are built on propriety technology, only Sony and it's 'good' friends can manufacture Memory Sticks.

Long answer: Sony is known to be very tight lipped when it comes to their own exclusive standards on flash memory. Since the license to manufacture Memory Stick is quite expensive, the manufacturers are forced into marking up the prices of the Memory Stick where as MMC Cards manufacturers do not need to pay for licenses to manufacture MMC Cards (which are compatible with SD slots/host adapters.)

Whenever you buy a portable device, always check on the prices of the memory cards before you buy.

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16y ago

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