Secure Digital

"SDHC" redirects here. For the gene, see SDHC (gene).

SD, SDHC, SDXC

SD (top), miniSD, microSD cards
Media type	Memory card
Capacity	SDSC (SD): 1 MiB to 2 GiB,    some 4 GiB were made SDHC: >2 GiB to 32 GiB SDXC: >32 GiB to 2 TiB
Developed by	SD Association
Dimensions	Standard: 32.0×24.0×2.1 mm (1.260×0.945×0.083 in) Mini: 21.5×20.0×1.4 mm (0.846×0.787×0.055 in) Micro: 15.0×11.0×1.0 mm (0.591×0.433×0.039 in)
Weight	Standard: ~2 g Mini: ~0.8 g Micro: ~0.25 g
Usage	Portable devices, including digital cameras and handheld computers
Extended from	MultiMediaCard (MMC)

Secure Digital (SD) is a non-volatile memory card format developed by the SD Card 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 de facto 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 in January 2000 to promote SD Card standards.^[3] The SD Association is a non-profit organization that sets memory card standards intended to simplify the use and optimize the performance of consumer electronics products. SDA today has about 1,000 member companies.
Secure Digital includes four card families available in three different form factors. The four families are the original Standard-Capacity (SDSC), the High-Capacity (SDHC), the eXtended-Capacity (SDXC), and the SDIO, which combines input/output functions with data storage.^[4][5][6] The three form factors are the original size, the mini size, and the micro size. Electrically passive adapters allow a smaller card to fit and function in a device built for a larger card. The SD card's small footprint is an ideal storage medium for smaller, thinner and more portable electronic devices.
There are many combinations of form factors and device families, although as of 2013, the prevailing formats are full- or micro-size SDHC and full or micro SDXC.^[citation needed]
The SDA uses several trademarked logos owned and licensed by SD-3C, LLC to enforce compliance with its specifications and assure users of compatibility.^[7]