The original Secure Digital (SD) card was introduced in 1999 as a successor to the MMC format. The format was introduced in August 1999 as Secure Digital by SanDisk, Panasonic (then often known as Matsushita), and free Slots Kioxia (then part of Toshiba). In 1999, SanDisk was approached by Panasonic (then generally known as Matsushita) and Kioxia (then part of Toshiba) to develop a new format as a second-generation successor to MMC. On the March 2003 CeBIT trade show, SanDisk launched and demonstrated the miniSD card format.

They are available in three physical kinds: the total-size SD, the smaller miniSD (now obsolete), and the smallest, Online slots microSD. The SD Association (SDA) adopted miniSD later that 12 months as a small-kind-issue extension to the SD card customary, meant primarily to be used in cell phones. Owing to their compact kind issue, SD cards have been extensively adopted in a variety of portable client electronics, including digital cameras, slots free camcorders, video sport consoles, Play online Slots cellphones, action cameras, and Online slots free digicam drones.

While technically modern, MMC adoption was slow, and even Nokia was sluggish to integrate support for it into its cellular devices.

To handle these challenges, SanDisk partnered with Siemens and Nokia in 1996 to develop a new postage stamp-sized memory card known as the MultiMediaCard (MMC). The microSD format was launched by SanDisk at CeBIT in 2004, free online slots initially under the identify T-Flash, later rebranded as TransFlash or Online slots free TF. In 1994, SanDisk introduced the CompactFlash (CF) format, one in all the primary profitable flash reminiscence card sorts.

In early 2000, the primary business SD cards offering 8 MB of storage have been launched, with larger capability versions following shortly after.