MicroSD Cards Explained

The difference between micro SDHC and SDXC

Probably the first thing you’ll notice is that cards are either called micro SDXC or SDHC. If these acronyms mean nothing to you, don’t worry, you’re not alone! Basically this just reflects the storage capacity of the card.

SDXC (Secure Digital Extended Capacity) can handle 64GB and above, whereas SDHC (Secure Digital High Capacity) only stores up to 32GB.

What does class mean?

The ‘class’ relates to the minimum data transfer speed of a card – something that’s important if you don’t want to slow down your new device. Aside from the capacity, this is probably the most important thing to consider.

SDHC and SDXC speed classes include 2, 4, 6 and 10.

The ‘class’ is the same as the cards minimum write speed (Class 10 = 10 MB/s for example). For HD recording, Class 10 should be the preferred choice.

UHS cards, what are they?

After ‘Class 10’, things get a bit tricky. In 2009 a standard called UHS was introduced, which allowed cards to achieve higher transfer and write speeds (up to 312MB/s).

Although these cards can achieve much higher performance rates, you are only likely to reach minimum transfer speeds listed above because very few devices support the upper limits at present.

UHS-1 has a minimum performance speed of 10MB/s, and UHS-3 has a minimum performance speed of 30MB/s – making it ideal for 4K video recording.

Will a good microSD card really speed up my phone?

The short answer is, yes. If you intend to store pictures, videos or apps, then the microSD card you choose will affect the speed at which your phone can access or store the relevant data.

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