Both the card and bus interface must be fully compatible to experience the speed benefits. The UHS bus interfaces are backwards compatible so you can use a UHS-II card in a device that supports UHS-I, but you won’t see the speed benefits of UHS-II as the card will default back to the lower specs of UHS-I. For example, a UHS-I U3-rated card guarantees a write speed of 30MB/s but has the potential for a read and write speed of up to 104MB/s if used with a device that supports a UHS-I bus interface.Ī UHS-II compatible card has a potential read and write speed of up to 312MB/s. The bus speeds refer to the theoretical data transfer rate of the interface itself while a U3-rated SD card has its own sustained write speed of 30MB/s. The UHS bus interfaces are denoted by a Roman numeral “I” or “II” symbol on the front of the card. These UHS bus interfaces indicate the theoretical maximum read and write speeds, unlike the sustained write speeds of speed classes. UHS-II: theoretical maximum transfer speeds up to 312MB/sīoth U1 and U3 memory cards can utilise the UHS-I bus interface, but are not compatible with the UHS-II bus interface. UHS-I: theoretical maximum transfer speeds up to 104MB/s.What makes the U1 and U3 memory cards more advanced than those in the Speed Class are that they use one of two UHS bus interfaces: As a rule of thumb, 4K-capable recording cameras will usually require at least a U3-rated SD card. The UHS Speed Class mainly refers to the minimum sustained write performance for recording videos and came about due to 4K-capable video recording devices needing faster write speeds. The UHS Speed Class is more commonly used nowadays than the Speed Class and many high-end cameras require at least a U3-rated memory card for many of its functions, such as recording high-resolution videos. U3 (UHS Speed Class 3): minimum write speed of 30MB/s.U1 (UHS Speed Class 1): minimum write speed of 10MB/s.There are two ratings within the UHS Speed Class: The next speed class up is the UHS (Ultra-High Speed) Speed Class and it’s denoted with the “U” symbol.
0 Comments
Leave a Reply. |