SD Card

Also found in: Dictionary, Thesaurus, Medical, Financial.

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In 2006, SDHC cards using the FAT32 file system superseded the original SD format, which used FAT16, and SDHC devices support SD.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 ?
Once you have rooted your Xperia device, you can install an app from the Play Store called "SDFix: KitKat Writable MicroSD" to allow third-party apps to write again on your SD card.
Magellan devices supporting the SD card product line are the Triton 400, 500, 1500, 2000 units, and the eXplorist 400, 500, 600, and XL units.
Here's how to easily and safety transfer files from the internal storage of your Samsung Galaxy S4 handset to a micro SD card.
zip&ref=http%25) Mod for fat32 SD card for stock kernel with init.
The SD Card Association is an open industry standards organization established in January 2000 by Matsushita Electric (Panasonic), SanDisk and Toshiba, and is supported by a consortium of over 900 companies.
First, the aforecited Resolution requires that the precinct results from the VCM's main SD card be imported to the CCS even if the ERs are already electronically transmitted by the machine to the canvassing centers.
will be demonstrating their new SDiD[TM] 1210 LF RFID SD Card along with their High Frequency SDiD[TM] including the SDiD[TM] 1010 NFC / RFID SD Card; the SDiD[TM] 1020 RFID SD Card and the SDiD[TM] 2010 NFC / RFID miniSD Card, products at RFID World 2007 - Booth 1430, March 26th to March 28th, 2007 at the Gaylord Texan Resort & Convention Center, Grapevine, Texas.
The SD Card format is the most widely adopted standard in the industry and the evolution to SD Speed Class specifications will allow the SD Card format to continue to meet the needs of these devices.
Many families now own more than one digital camera, and with the SD card multi-packs, every SD-enabled point-and-shoot digital camera in the household can be equipped with a new card at a reasonable price.
With more and more new models of hand held device having built-in Micro SD card slot (including cellular, PDA, MP3, DSC and notebook), Pretec i-Disk Micro Reader is ideally the best companion for today's mobile device.
Voice Recorder - Allows the user to record presentations, meetings or notes and saves to an SD card in .