"SDHC" redirects here. For the gene, see SDHC (gene).
See also: Comparison of memory cards
For the earlier form, see MultiMediaCard.
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
Blocksize
Variable
Readmechanism
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
Writemechanism
Variable
Standard
SD Standard
Developedby
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)
Extendedfrom
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).[1] 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.[2]
In January 2000, the companies formed the SD Association (SDA), a non-profit organization to create and promote SD Card standards.[3] As of 2023[update], 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.[4]
^"Matsushita Electric, SanDisk and Toshiba Agree to Join Forces to Develop and Promote Next Generation Secure Memory Card". DP Review. 1999-08-24. Retrieved 2016-02-23.
^"Welcome to SD-3C, LLC". SD-3C. 2015-03-30. Retrieved 2016-02-23.
^"Matsushita Electric, SanDisk and Toshiba to Form SD Association to Promote Next Generation SD Memory Card". Toshiba. 2015-03-30. Retrieved 2016-02-23.
^"Using SD Memory Cards is Easy". SD Association. 2010-06-22. Archived from the original on 2021-10-29. Retrieved 2014-01-02.
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