Speed Class: Indicated by a number inside a C, the original classification system for SD cards.U1 starts at 10MB/s write speed, U3 starts at 30MB/s write speed, and both are perfectly adequate for most Android phones. UHS Speed Class: Indicated by a 1, 2, or 3 inside a U, this class is still used on most cards today.For example, V30 starts at 30MB/s write speed, V60 starts at 60MB/s write speed, and V90 starts at 90MB/s, but unless your phone shoots 8K video, you probably don't need a V90 card. Video Speed Class: Indicated by a stylized V followed by numbers from 6 to 90, this class is one of the newer classification systems and was developed specifically for shooting ultra-high-definition video.So here's your cheat sheet to these formats and which ones are better than others: There are many different specs used to classify microSD card speeds, and most cards have at least two of these classifications and the straight read/write speeds listed for the card. From $8 at Amazon What do all these classes mean for your card?
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Class 10 for Full HD video recording and playback (Full HD (1920x1080) video support may vary based upon host device, file attributes, and other factors.This ultra-rugged card can withstand just about anything, from water to shock, extreme temperatures, and even X-ray radiation.Results may vary based on host device, app type and other factors.) Load apps faster with A1-rated performance (A1 performances is 1500 read IOPS, 500 write IOPS.Results may vary based on host device, file attributes and other factors.) Up to 98MB/s transfer read speed (Based on internal testing performance may be lower depending on host device, interface, usage conditions and other factors.) lets you move up to 1000 photos in a minute (Based on 4.1GB transfer of photos (Average file 3.5MB) with USB 3.0 reader.
Actual user storage less.) to store even more hours of Full HD video (Approximations results and Full HD (1920x1080) video support may vary based on host device, file attributes and other factors.)