EntityQ466977· pop 43· linked from 2,609 articles

SD card

removable memory storage for portable devices

Key facts

Media type: Memory card
Capacity: SD : Up to 2 GB SDHC : Up to 32 GB SDXC : Up to 2 TB SDUC : Up to 128 TB
Block size: Variable
Read mechanism: Default : Up to 12.5 MB/s High-speed : Up to 25 MB/s UHS-I : Up to 104 MB/s UHS-II : Up to 312 MB/s UHS-III : Up to 624 MB/s Express : Up to 3940 MB/s
Developed by: SD Association
Dimensions: Standard : 32×24×2.1 mm (1.260×0.945×0.083 in) 1,612.8 mm (0.09842 cu in) Mini : 21.5×20×1.4 mm (0.846×0.787×0.055 in) 602 mm (0.0367 cu in) Micro : 15×11×1 mm (0.591×0.433×0.039 in) 165 mm (0.0101 cu in)
Weight: Standard : ~ 2 g Mini : ~ 0.8 g Micro : ~ 0.25 g
Extended from: MultiMediaCard
Released: August 1999

via Wikipedia infobox

Article

The SD card is a proprietary, non-volatile, flash memory card format developed by the SD Association (SDA). They come in three physical forms: the full-size SD, the smaller miniSD (now obsolete), and the smallest, microSD. Owing to their compact form factor, SD cards have been widely adopted in a variety of portable consumer electronics, including digital cameras, camcorders, video game consoles, mobile phones, action cameras, and camera drones.

The format was introduced in August 1999 as Secure Digital by SanDisk, Panasonic (then known as Matsushita), and Kioxia (then part of Toshiba). It was designed as a successor to the MultiMediaCard (MMC) format, introducing several enhancements including a digital rights management (DRM) feature, a more durable physical casing, and a mechanical write-protect switch. These improvements, combined with strong industry support, contributed to its widespread adoption.