SD card

Secure Digital, officially abbreviated as SD, is a   format developed by the  (SDA) for use in portable devices.

History
The standard was introduced in August 1999 by joint efforts between, (Matsushita Electric) and  as an improvement over s (MMC), 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.

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

Apple models with SD card support
Reading SD cards in models without a built-in slot is possible through the use of a USB adapter or dongle.
 * iMac (aluminum unibody)
 * MacBook Air 13" (pre-Retina display)
 * MacBook Pro (pre-Retina display)