What does v30 mean on SD cards?

Related questions

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4. How much memory does 1080p video take?
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Tags

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2. #designation
3. #performance
4. #video
5. #edition
6. #introduction
7. #sustain
8. #popular
9. #speed
10. #meaning
11. #bears
12. #sandisk
13. #extreme
14. #level
15. #update
16. #recording
17. #class
18. #continuous
19. #least