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The Video Speed Class 10 (V10) SD card has a minimum write speed of 10MB/s. While, V30 is 30MB/s, V60 is 60MB/s and V90 is 90MB/s. The SD card with this speed class is specially used for recording 8K video content. To know an SD card’s class, you can just look at the body of the card.
Class 10 SD cards have write speeds of 10 Mb/s and up and are designed to operate under the high speed bus interface. Beyond Class 10 is the UHS Speed Class. UHS stands for ultra high speed and includes cards that have speeds up to 312 Mb/s.
First, there’s Speed Class. This is indicated by a C symbol surrounding a number. On most modern SD cards, that number is 10, which is the highest classification for this class. Class 10 cards are capable of at least 10 megabytes (MB) per sec. Since most cards are capable of much, much faster speeds, this symbol is a bit outdated.
There are two special speed classes and they are UHS 1 and UHS 3. They are more expensive than the standard classes and their minimum write speeds are 10MB/s and 30MB/s respectively. SD cards with these two kinds of speeds are specially designed for professional use such as 4K-capable cameras.
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