SD Card

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SD Card

(Secure Digital Memory Card) A family of very popular flash memory cards used for storage in portable devices. Introduced in 1999 by Panasonic, Toshiba and SanDisk, the original, full-size SD Card is the most popular digital camera storage, and the smaller mini and micro versions are widely used in mobile devices. Cards come in various write speeds for video recording (for details, see SD Card classes).

Although SD Cards support encryption and content protection (the "Secure" in SD), they have been mostly used for regular storage. SD uses NAND flash technology (see flash memory).

Full-Size Card
With capacities available up to 1TB, the full-size SD Card is the original and largest in the series. It uses the same 32x24mm form factor but is slightly thicker than its MultiMediaCard predecessor (see MMC), and SD Card readers accept both formats.

Mini and Micro Sizes
Introduced in 2003 and 2005 respectively, the smaller miniSD and microSD formats are electrically and software compatible with the full-size SD. Using adapters, they plug into full-size slots (see illustration below). Subsequent SDHC and SDXC formats also came in mini and micro versions; however, all miniSD cards were nowhere near as popular as the microSD formats (see microSD).

SDHC (High Capacity) and SDXC (Extended Capacity)
In 2006, SDHC cards using the FAT32 file system superseded the original SD format, which used FAT16, and SDHC devices support SD. Introduced in 2009, SDXC cards raised the maximum capacity to 2TB by using the exFAT file system, and SDXC devices also support SDHC cards. See Video HD, Eye-Fi, gruvi card and SDIO card.

Ultra High Speed - UHS-I/II
In 2010, the UHS-I interface was introduced for SDHC and SDXC cards, dramatically increasing the bus speed for 4K video and continuous still recording. For more details, see SD Card classes.

Micro, Mini and Full-Size
The full-size SD Card (right) is approximately 1.25 inches tall by one inch wide. The "gruvi" is a copy protected microSD. (Image courtesy of SanDisk Corporation,

SD Card Adapter
Devices that use miniSDs and microSDs accept only those card types, but general-purpose SD readers have full-size slots and require adapters for the smaller cards.
References in periodicals archive ?
Please visit the SD Card Association booth #9836 located in the Central Hall.
Matsushita said it will also put on the market on April 8 two models of a compact component stereo capable of transferring music onto an SD card directly from music CDs.
SD cards are storage devices with the "potential to become one of the indispensable recording media in the 21st century's digital networking society," Matsushita said in a statement.
According to the report, one of the key growth drivers in the SD Card market in India is the increasing demand for SD cards in smartphones.
SD cards are ideal for smart phones, digital cameras, tablet computers and GPS devices, but are not used for system boot because they lack execute-in-place (XiP) capability.
Exhibit 1: SD Card Market in India 2011-2015 (in US$ million)
the SD Card has shown impressive growth since its introduction in 2000, capturing 30 percent of the worldwide market in revenue in 2003.
The report analyzes the current SD Card market landscape in India and its growth prospects.
CE-ATA Hard Disk Drive (HDD) / SDIO/ SD Card Solution - This reference platform integrates high performance CE-ATA and SDIO host controllers for the Marvell([R]) PXA3xx application processors for connectivity to a variety of storage and wireless technologies.
The format is further supported by the more than 650 members of the SD Card Association (SDA), a consortium working to set industry standards and promote the acceptance of SD Memory Cards in a wide variety of applications.