The SD Association unveils a new UHS Speed Class 3 and matching symbol for SD cards capable of writing a minimum of 30Mb/s for 4K2K video.

SD products are rated at a minimum speed, the Speed Card Rating. A Class 2 SD card can write at least 2MB/s, a Class 4 SD card can write at least 4MB/s and so on.

I have a Canon SD980 with a microSDHC memory card (w/adapter). Will I see any benefit buying one of those 'ultra' speed SD cards?

If you are wondering what are SD card Classes are and why they are important this quick guide explains why you must match the card speed to ...

Around the same time, the SD (Secure Digital) card format began dominating the market for in-camera storage media, particularly in smaller cameras. Being based on solid state memory they have no ...

We are also told that the UHS Speed Class 3 (U3) devices will be backwards compatible and work with older SD cards.

Most SD cards with a high-capacities generally also tend to have high speeds, so you don’t have to worry as much about a high capacity card with a low speed. If you don’t see the speed of the SD card ...

Between the classes and ratings, picking out the right SD card can be a challenge. We break down the most important specs and details so you can decipher the GB, the MB/s the class numbers and the ...

When shopping for memory cards, we tend to compare cards by the “X” speed, such as 80X, 150X, etc. But what are we measuring? The X speed is how much information the card can accept per second, also ...

High speed SD cards will sometimes use the x rating as class ratings max out at Class 10, which is a paltry 10 MB/s minimum. Moving onto CF cards, the rating system is much simpler.

Most SD cards should have a number on them, such as 2, 4, 6, or 10 to denote their minimum write speed in MB/seconds. Sandisk's class 4 cards, for example, transfer speeds at 15 MB/sec, and their ...