What is a class 10 SD card?
Currently, the SD Association recognizes two Speed Classes:
"Speed Class" and "UHS Speed Class." Speed Class applies to SD,
miniSD, microSD, SDHC, miniSDHC, microSDHC, SDXC and microSDXC
cards. These are denoted by a class number within a C-shaped logo.
The higher the class number, the faster the card. In order to bear
the SD Speed Class logo, card manufacturers have to adhere to the
minimum standards set out by the SD Association.
Class 2 is the slowest SD card speed. Class 2 has a write speed
of about 2 Mb/s and is suitable for standard definition video
recording. Class 4 and Class 6 have write speeds of about 4 Mb/s
and 6 Mb/s, respectively, and can be used for HD video recording.
These three classes of SD cards are designed to operate under the
normal bus interface.
Class 10 SD cards have write speeds of 10 Mb/s and up and are
designed to operate under the high speed bus interface.