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(Secure Digital I/O Card) A version of the SD Memory Card that adds Input/Output While an SD card is a memory card that simply stores files, an SDIO card can be complete hardware accessory. Examples of SDIO cards include Wi-Fi and Bluetooth adapters, GPS receivers, TV tuners, cameras, RFID readers, and fingerprint readers.
A device with an SDIO card slot can also accept standard SD memory cards, but not necessarily vice-versa. A device must specifically be "SDIO-capable" in order to be compatible with SDIO cards.
SDIO is NOT SDHC. Nor is a SDIO (high capacity) the same as a SDHC slot, this bit of deception and confusion and illusion permits HP to confuse the public as to just what they really are buying. If that slot was a real SDHC slot then a SDHC class 6 memory card would need to operate far faster than it does. HP has from the very first played very loose with just what kind of slots it's iPAQs have.
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