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 (www.sdcard.org).

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, 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 ?
The Blackmagic Pocket Cinema Camera features built in CFast and SD UHS-II card recorders, and a USB-C expansion port for recording direct to an external media disk.
Well, CNET pointed out some things starting with the fact that the computer's SD card slot still can't support UHS-II and still has all the messy connectors at the back that make the computer seem like an old model.
It also sports a UHS-II SDXC card reader and a 3.5mm headphone jack.
Flagship products include ProGrade Digital CFexpress and ProGrade Digital SDXC UHS-II V90 memory cards offered in a range of capacities and USB 3.1, Gen 2 high speed readers.
A continuous shooting rate of up to 5 fps, or 4 fps with Servo AF, combined with a UHS-II card slot, gives an unlimited [v] buffer when shooting JPEG or RAW files -- enough for capturing action when travelling.
- Professional-level capacities for CFast 2.0 and SDXC UHS-II memory cards
The GH5S is equipped with a double SD Memory Card slot, compatible with the high-speed, high-capacity UHS-II and Video Speed Class 60.
Other improvements include a higher resolution OLED electronic viewfinder (EVF), dual SD card slots (for UHS-II and UHS-I cards) and USB Type-C (USB 3.1, Gen1) port, etc.
Also, the G9 has a double SD Memory Card slot, compatible with the high-speed, high-capacity UHS-II.
Depending on the data transfer speed UHS SD card are segmented into UHS-I and UHS-II type cards.
The cards are the first in the EXCERIA line-up to integrate a newly developed controller complaint with UHS-II the ultra high speed serial bus interface defined in SD memory Card Standard Ver..