What is Class on a SD card?

Don’t worry, I didn’t know either…it is writing speed.  The higher the class the higher the speed.  Many devices will have a class rating but in general most cards are backward compatible.   So if you take a picture, the camera will write to the card at the cameras speed if the SD card matches the camera.   The speed of the transfer of data is based on the slowest device.  So if your camera writes at 2 MB/s and you have a Class 4 card, the data is saved to the card at 2 MB/s.   If you have a camera that writes at 6 MB/s and you have a Class 2 card the data will only transfer at 2 MB /s.

Class 2- 2 MB/s
Class 4- 4 MB/s
Class 6- 6 MB/s
Class 10- 10 MB/s


About TCAT Shelbyville IT Department

The Tennessee College of Applied Technology - is one of 46 institutions in the Tennessee Board of Regents System, the seventh largest system of higher education in the nation. This system comprises six universities, fourteen community colleges, and twenty-six Applied Technology Colleges.
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1 Response to What is Class on a SD card?

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