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 camera and extra phone storage. 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 (www.sdcard.org). SD uses NAND flash technology (see flash memory).

Capacities have reached 400GB for microSD cards and 512GB for the full size card. SD cards support various write speeds for video recording (see SD card classes). Although SD cards support copyright protection (the "Secure" in SD), they were never much used for that purpose (see CPRM). 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, www.sandisk.com)







SDHC, SDXC, SDUC
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, www.sandisk.com)

Year   Maximum    FileFormatInto   Capacity   System

    SD     1999      2GB     FAT16
    SDHC   2006     32GB     FAT32
    SDXC   2009      2TB     exFAT
    SDUC   2018    128TB     exFAT
References in periodicals archive ?
M2 EQUITYBITES-November 3, 2016-Kingston Digital releases 256GB microSDXC Class 10 UHS-I Card
TELECOMWORLDWIRE-November 3, 2016-Kingston Digital releases 256GB microSDXC Class 10 UHS-I Card
This deal is valid on the company's three Limited Edition microSD cards, namely the 8GB Class 4 (SDC4), 16GB CLass 10 UHS-I (SDC10G2), and 32Gb CLass 10 UHS-I (SDC10G2).
Western Digital Corporation a global storage technology and solutions leader, today introduced a new suite of 256 gigabyte (GB) microSD cards, which includes the new 256GB SanDisk Extreme microSDXC UHS-I card the fastest microSD card in its class.
The key features of UHS-I cards include support for UHS104 which provides 104MBit/s bus speed on the SD interface and a maximum read speed of 95MB/sec and a write speed of 80MB/sec.
Depending on the data transfer speed UHS SD card are segmented into UHS-I and UHS-II type cards.
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.
WORLDWIDE COMPUTER PRODUCTS NEWS-September 12, 2014-SanDisk introduces the Extreme PRO SDXC UHS-I Memory Card 512GB
Lexar high-performance micro-SDHC and microSDXC UHS-I cards combine high-speed memory cards and USB 3.
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.
The compliance test package, helps design engineers accelerate the turn-on and debug of SD UHS-I card-based systems used in portable consumer electronics.