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15 Aug 2018
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SD, SDHC and SDXC Card Capacity Choices?

SD Card SPEC
Minimum
Sequentail Write Speed
Read Speed Speed Class  Application
Speed Class UHS Speed Class Video Speed Class(New)
Capacity   SDHC
(2GB~32GB)
SDXC
(32GB~2TB)
SDXC
(32GB~2TB)
90 MB/sec       V90 8K video files at 60/120 fps (UHS bus)
60 MB/sec       V60
30 ~ 45 MB/sec up to 90 MB/sec   U3 V30 1080p and 4K video files at 60/120 fps (UHS bus)
10 ~ 14 MB/sec 17 ~ 20 MB/sec C10 U1 V10 Full HD (1080p) video recording and consecutive recording of HD stills ( High Speed bus, Class C10), real-time broadcasts and large HD video files (UHS bus, Classes U1 and V10)
6 MB/sec up to 16 MB/sec C6   V6 High-definition video(HD) recording including Full HD (from 720p to 1080p/1080i)
4~5 MB/sec 10 ~ 13 MB/sec C4    
2 MB/sec   C2     SD video recording