What is the difference between sdhc and uhs

This stands for Ultra High Speed and refers to minimum sustained writing performance for recording video. UHS came about due to 4K-capable video devices needing faster write speeds. As a rule of thumb, 4K-capable camcorders will usually require at least a U3 rated SD card.

It might sound obvious, but the safest way to make sure you buy the correct card is to first consult your product's user guide or specifications, at least to be sure if your device takes full-size SD or microSD cards.

Checking before you buy an SD card is particularly important if your device has specific requirements, such as many 4K camcorders. These will usually explicitly state what type of memory card is required in order to record at the top resolution or bit rate. If you're not recording in 4K, the speed might not be so important. A faster-rated card will still be useful if you're using the card to expand the storage in a smartphone or laptop, as a faster read and write speed will make it more responsive.

Faster cards in a still image camera will also mean being able to take more or faster photos in burst mode, as these can be written to the card far quicker. Class 10 cards are usually not much more expensive so it's worth paying the extra. Sign up for our daily newsletter Newsletter. Will Georgiadis. Nathan Spendelow. See related. Available on August 2nd, Questions or comments? Feel free to leave your feedback below! Please note comments must be approved before they are published. Ships from the USA.

Your shopping cart is empty. Skip to main content. Video Speed Class is defined to answer a demand for high resolution and high quality 4K8K video recording and it also has an important feature to support next generation flash memory such as 3D NAND. SD Speed Class. Speed Class supported host can indicate Speed Class symbol somewhere on the product, package or manual.

Consumers can find the best card for a host via Speed Class symbol match; choose the same or higher class symbol card than class symbol of the host indicated. Video Speed Class is also the same. Note that expected write speed will not be available by a combination of different class symbols between host and card such as Host Class 10 and Card U1, Host U1 and Card V10, etc. By repeating deletion and write of files, data area is gradually fragmented and it influences write speed.