articles/Computers/media-cards-page8

Choosing media cards can be a minefield - part 8 of 1 2 3 4 5 6 7 8

by Mike McNamee Published 01/12/2016

UHS Speed Class

The next rating is the UHS Speed Class. 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.

The SD Association has two UHS Speed Classes, UHS Speed Class 1 and UHS Speed Class 3. UHS Speed Class 1 supports a minimum 10MB/s write speed, whereas UHS Speed Class 3 supports at least 30MB/s write speed. The UHS Speed Class is denoted by either a 1 or 3 inside of a bucket U symbol. As a rule of thumb, 4K-capable camcorders will usually require at least a U3 rated SD card.

UHS Bus Speed

Things get a little more confusing as UHS Speed Class-rated devices will also use one of two UHS Bus Interfaces that indicates the theoretical maximum read and write speeds.

They’ll be listed as either UHS-I or UHS-II to show which interface is used. UHS-I devices have a maximum read speed of 104MB/s, whereas a UHS-II card has a maximum read speed of 312MB/s. Note, that unlike the UHS Speed Class, these are not sustained speeds.

Please Note:
There is more than one page for this Article.
You are currently on page 8

• Choosing media cards can be a minefield page 1
  
• Choosing media cards can be a minefield page 2
  
• Choosing media cards can be a minefield page 3
  
• Choosing media cards can be a minefield page 4
  
• Choosing media cards can be a minefield page 5
  
• Choosing media cards can be a minefield page 6
  
• Choosing media cards can be a minefield page 7
  
• Choosing media cards can be a minefield page 8
  

Contact Mike McNamee

1st Published 01/12/2016
last update 21/07/2022 08:46:25

More Computers Articles

There are 0 days to get ready for The Society of Photographers Convention and Trade Show at The Novotel London West, Hammersmith ...
which starts on Wednesday 15th January 2025