# MicroSD Card
|  | Secure Digital, officially abbreviated as SD, is a proprietary, non-volatile, flash memory card format the SD Association (SDA) developed for use in portable devices. |
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| | wikipedia:: [SD card](https://en.wikipedia.org/wiki/SD_card) |
[Overview | Understanding microSD and SD cards: speeds, markings and more | Adafruit Learning System](https://learn.adafruit.com/understanding-microsd-and-sd-cards-speeds-markings-and-more)

[[Raspberry Pi]] - Use Class 10, v10
4k video recording/drones - Class 30, v30