secure digital

基本解释

It has Compact Flash (CF) and Secure Digital (SD) slots and can support non-storage devices such as an 802.11b wireless CF card or an Ethernet adapter.
它还有 CF（Compact Flash）和 SD（Secure Digital）插槽，可以支持非存储设备，例如 802.11b 无线 CF 卡或以太网适配器。
A link to sample code illustrating a Web service that combines document generation and secure digital signatures in an example workflow is provided below.
下面提供了样例代码的链接，该代码阐述了将文档生成和样例流程中安全的数字签名相结合的 Web 服务。
Typically, nonvolatile memory devices are hard disks, but they can also be solid-state devices like secure digital (SD) cards and even magnetic tape devices (all but obsolete now).
非易失性存储设备一般为硬盘，但也可以是安全数字（SD）卡之类的固态设备，甚至可以是磁带设备（不过现在已经过时了）。

The tiny Secure Digital memory card is beginning to loom large on the consumer electronics landscape.
FORBES: Magazine Article
The Secure Digital (SD) memory card will hold up to two hours of video on 64 megabytes.
FORBES: Panasonic Gets Minuscule
Games will be made available on Secure Digital memory cards, and the Zodiac will have two SD slots.
FORBES: Magazine Article