SDIO may refer to:
*
Secure Digital Input Output
Secure Digital, officially abbreviated as SD, is a proprietary non-volatile flash memory card format developed by the SD Association (SDA) for use in portable devices.
The standard was introduced in August 1999 by joint efforts between SanDis ...
, a type of Secure Digital card interface. It can be used as an interface for input or output devices.
*
Strategic Defense Initiative Organization, an organization set up to oversee the Strategic Defense Initiative; now known as the Missile Defense Agency.
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