SDIO may refer to:
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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 SanDi ...
, a type of Secure Digital card interface. It can be used as an interface for input or output devices.
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Strategic Defense Initiative Organization
The Strategic Defense Initiative (SDI), derisively nicknamed the "''Star Wars'' program", was a proposed missile defense system intended to protect the United States from attack by ballistic strategic nuclear weapons (intercontinental ballistic ...
, an organization set up to oversee the Strategic Defense Initiative; now known as the Missile Defense Agency.
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