What is a Class 4 Micro SD card?

Related questions

1. What is the difference between a Class 4 and Class 10 micro SD card?
2. What do classes mean on SD cards?
3. How fast is a Class 10 SD card?
4. What is a good size SD card for DSLR?
5. What is a Class 10 SD card?
6. What does 633x mean on a SD card?
7. Which is faster USB 3.0 or SD card?
8. Is SDXC faster than SDHC?
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17. #designed