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Secure Digital, officially abbreviated as SD, is a proprietary non-volatile 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 SanDisk, Panasonic (Matsushita Electric) and Toshiba as an improvement over MultiMediaCards (MMC),[1] and has become the industry standard. The three companies formed SD-3C, LLC, a company that licenses and enforces intellectual property rights associated with SD memory cards and SD host and ancillary products.[2]

The companies also formed the SD Association (SDA), a non-profit organization, in January 2000 to promote and create SD Card standards.[3] SDA today has about 1,000 member companies. The SDA uses several trademarked logos owned and licensed by SD-3C to enforce compliance with its specifications and assure users of compatibility.[4]

Apple models with SD card support[]

Built-in SD card support was phased out of recent Apple models, such as notebooks with Retina displays. Reading SD cards in such models require the use of a USB adapter or dongle. Industry analysts have reported that Apple is planning to re-introduce support for SD cards in 2021 models.[5]


  1. Matsushita Electric, SanDisk and Toshiba Agree to Join Forces to Develop and Promote Next Generation Secure Memory Card. DP Review (1999-08-24). Retrieved on 2016-02-23.
  2. Welcome to SD-3C, LLC. SD-3C (2015-03-30). Retrieved on 2016-02-23.
  3. Matsushita Electric, SanDisk and Toshiba to Form SD Association to Promote Next Generation SD Memory Card. Toshiba (2015-03-30). Retrieved on 2016-02-23.
  4. Using SD Memory Cards is Easy. SD Association (2010-06-22). Retrieved on 2014-01-02.
  5. Bloomberg: Next MacBook Pro to Feature SD Card Reader by Joe Rossignol, MacRumors. 2021-01-22.

External links[]

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