secure digital card

基本解释

Secure Digital Memory Card. A flash based memory card designed to provide secure high capacity data storage.
安全电子存储卡。一种基于为提供安全的大容量数据存储功能而设计的闪存。
Compared to the Multi Media Card composed of 7 connection pins, the Secure Digital card is composed of 9 connection pins.
相对于多媒体卡由7针连接，安全数码卡，是由9连接引脚。
The ARM processor is connected with a multi-way signal detecting channel, a LCD (Liquid Crystal Display) screen, a keyboard, a SD (Secure Digital) card seat and a serial port.
它包括ARM处理器，该ARM处理器连接多路信号检测通道、LCD显示屏、键盘、SD卡座和串口。
ip.com

For those who don't understand that any SD card will work in your Wii, the 2GB Rock Band 2 Secure Digital card will reportedly hold up to 75 downloadable songs -- or 2GB of anything, actually.
ENGADGET: SanDisk releases 2GB Rock Band 2 SD card for all your downloadable content
The tiny Secure Digital memory card is beginning to loom large on the consumer electronics landscape.
FORBES: Magazine Article
Stick a Secure Digital memory card in a slot, and you can have it record video thumbnails at regular intervals as you shoot.
FORBES: Magazine Article