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）。

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Games will be made available on Secure Digital memory cards, and the Zodiac will have two SD slots.

FORBES: Magazine Article

It will have two slots for Secure Digital memory cards, which will let you really max out storage capacity, or use cards with content.

FORBES: Magazine Article

We noted in May the availability of Panasonic 's SV-AV10--a small and sleek MP3 player and camcorder in one which stores data on tiny Secure Digital memory cards that certainly don't hold as much as a 20-gigabyte hard drive.

FORBES: Magazine Article