SD card

Secure Digital
(SD, SDHC, SDXC, SDUC)
	From top to bottom: SD, miniSD, microSD
Media type	Memory card
Capacity	SD: Up to 2 GB; SDHC: over 2 GB to 32 GB; SDXC: over 32 GB to 2 TB; SDUC: over 2 TB to 128 TB;
Block size	Variable
Read mechanism	Standard: 12.5 MB/s; High-speed: 25 MB/s; UHS-I: 50 MB/s or 104 MB/s; UHS-II: 156 MB/s full-duplex, or 312 MB/s half-duplex; UHS-III: 312 MB/s full-duplex, or 624 MB/s half-duplex; Express: ≥ 985 MB/s full-duplex;
Write mechanism	Variable
Standard	SD Standard
Developed by	SD Association
Dimensions	Standard:; 32.0×24.0×2.1 mm (1.260×0.945×0.083 in); 1,612.8 mm3 (0.09842 cu in); Mini:; 21.5×20.0×1.4 mm (0.846×0.787×0.055 in); 602 mm3 (0.0367 cu in); Micro:; 15.0×11.0×1.0 mm (0.591×0.433×0.039 in); 165 mm3 (0.0101 cu in);
Weight	Standard: ~2 g; Mini: ~800 mg; Micro: ~250 mg;
Usage	Portable devices, such as digital cameras and mobile phones (including most smartphones)
Extended from	MultiMediaCard
Released	August 1999

Secure Digital, officially abbreviated as SD, is a proprietary, non-volatile, flash memory card format the SD Association (SDA) developed for use in portable devices.

The standard was introduced in August 1999 by SanDisk, Panasonic (Matsushita) and Toshiba as an improvement on MultiMediaCards (MMCs). SDs have become an industry standard. The three companies formed SD-3C, LLC, a company that licenses and enforces intellectual property (IP) rights associated with SD memory cards and SD host-and-ancillary products.

In January 2000, the companies formed the SD Association (SDA), a non-profit organization to create and promote SD Card standards. As of 2023, the SDA has approximately 1,000 member companies. It uses several SD-3C-owned trademarked logos to enforce compliance with its specifications and denote compatibility.

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