Definition of SD card classes

A Guide to SD Card Speed & Other Specs - Focus Camera

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.[1][2] The format was introduced in August 1999 as

SD Express － 最大128TBの次世代SD規格を発表 | CineD

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