SD Card

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SD Card

(Secure Digital Memory Card) A family of compatible and very popular flash memory cards used primarily for storage in cameras and phones. Introduced in 1999 by Panasonic, Toshiba and SanDisk as the successor to the MultiMediaCard (see MMC), the SD technology is managed by the SD Association (

Capacities reached 512GB for the full-size card and 1TB for the tiny microSD. For video recording, SD cards support various write speeds (see SD card classes), and although SD cards were designed for copyright protection (the "Secure" in SD), they were never much used for that purpose (see CPRM). SD uses NAND flash technology (see flash memory). See Video HD, Eye-Fi and SDIO card.

SD Express - More Speed
In 2018, SD Express was introduced, which supports additional interfaces and higher speeds while keeping backward compatibility with the billions of SD hosts in the world. See SD Express.

MicroSD - MiniSD - Full-Size
With storage up to 400GB, the tiny 15x11x1mm microSD card (left) is the most popular, and it obsoleted the miniSD format. The full-size 32x24x2mm card is available up to 512GB. Adapters let microSDs plug into full-size slots (see microSD). (Images courtesy of SanDisk Corporation,

As storage increased, HC, XC and UC formats were introduced to accommodate the larger capacities. All newer-format SD slots accept the older cards. See FAT32 and exFAT. (Images courtesy of SanDisk Corporation,

Year   Maximum    FileFormatInto   Capacity   System

    SD     1999      2GB     FAT16
    SDHC   2006     32GB     FAT32
    SDXC   2009      2TB     exFAT
    SDUC   2018    128TB     exFAT
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References in periodicals archive ?
You can now transfer files in nearly half the time over standard UHS-I microSD cards available in the market.
* SanDisk Extreme UHS-I microSD card with 1TB storage capacity announced.
Data storage technology and solutions company Western Digital Corporation (Nasdaq:WDC), announced on Wednesday its 400GB SanDisk Ultra microSDXC UHS-I card, reportedly the world's highest-capacity microSD card for use in mobile devices.
Kingston Digital, Inc., the Flash memory affiliate of Kingston Technology Company, Inc., has added 256GB capacity to its line of Class 10 UHS-I microSDHC / microSDXC cards, the company said.
TELECOMWORLDWIRE-November 3, 2016-Kingston Digital releases 256GB microSDXC Class 10 UHS-I Card
Depending on the data transfer speed UHS SD card are segmented into UHS-I and UHS-II type cards.
Toshiba's Digital Products Division (DPD), a division of Toshiba America Information Systems, Inc., has introduced EXCERIA UHS-I SD Memory Cards, a new line of EXCERIA products focused on continuous shooting and full HD (including 4K resolution) video, a perfect fit for professional or amateur photographers in a wide-range of sizes at an affordable price.
Lexar high-performance micro-SDHC and microSDXC UHS-I cards combine high-speed memory cards and USB 3.0 readers for a quality memory solution.
(Transcend), a worldwide leader in storage and multimedia products, today announced the launch of its new 32GB SDHC Class 10 UHS-I (Ultra High Speed Class 1) memory card.
SanDisk Corporation, a global leader in flash memory storage solutions, has unveiled the 64GB SanDisk Extreme Pro SDXC UHS-I card as part of a comprehensive new suite of retail products.