(
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)
Year Maximum File
Format Into Capacity System
SD 1999 2GB FAT16
SDHC 2006 32GB FAT32
SDXC 2009 2TB exFAT
SDUC 2018 128TB exFAT
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)