Memory cards. Which one to choose?

memoryIt’s easy to take your camera’s memory card for granted. However, you only have to go into a camera shop to realise that memory cards come in a bewildering array of sizes, formats and speeds.

It’s easy to work out what memory card format you need – unless you shoot with the Nikon D4s, it’s either Compact Flash or SD.

As far as capacity is concerned, your camera’s LCD display will tell you how many images you can save on your current memory card.

If you shoot raw files, which we usually recommend, you’ll need more storage space, but a 16 gigabyte card should be enough, although individual needs will vary.

Understanding memory card formats

Compact Flash is the oldest memory card format still in use. They’ve disappeared from most beginner and enthusiast DSLRs, but are still going strong in the top-end pro models.

They come in two types, and Type I cards fit all cameras. Type II cards are fatter, and are no longer made or supported.

Most Type II ‘cards’ were a clever but fragile miniature hard disk ‘MicroDrive’ design, but solid state Type I cards have long since outstripped the capacity of Type II cards.

SD cards are the most common memory cards for cameras, and are used across most camera ranges range except for in top-end pro models.

Although all SD memory cards are physically the same, there are three types. SD cards are the oldest and will work in any camera with an SD card slot.

SDHC cards are newer but only work in SDHC-compatible cameras (see the list overleaf). SDXC cards are newer still and need an SDXC-compatible camera.

Finally, XQD is a brand-new format used in the Nikon D4s (and D4) that we mentioned earlier. The cards offer potentially huge capacities and ultra-fast data transfer speeds, but it’s early days, and the future of the format is by no means guaranteed.

Which memory cards should you use for your camera?

You can find more information about your specific camera’s requirements in your manual, but here we’ve listed the different types of memory cards for cameras as a rough guide.

Don’t worry if your camera’s memory card size is different than what your manual suggests.

Your manual will list sizes available at the time the camera was released, but higher-capacity memory cards for cameras released later should work too. Your manual only lists memory cards which have been tested by your manufacturer.

Common memory cards for cameras

Compact Flash Type I cards are 3.5mm thick and are still used today. Newer cards and cameras use the faster UDMA interface for higher transfer speeds.

Compact Flash cards come in many capacities – in 2013, SanDisk launched a 256GB card.

Compact Flash Type II cards were 5mm thick and are no longer supported by most modern DSLRs.

Most Type II CF cards were ‘MicroDrives’ – tiny spinning hard disk drives in a CF-sized case.

SD cards are the oldest and least powerful SD card type, with a maximum capacity of 2Gb. You can still use SD cards in modern digital cameras, but their low capacity limits their usefulness.

As a result, standard SD cards are rarely seen now – SDHC is the new norm.

SDHC cards are a faster, higher-capacity replacement for the SD format. Card sizes go up to 32Gb, with card speeds up to Class 10 and UHS-I.

You can only use SDHC cards in cameras that support them – and most current DSLRs support SDHC.

SDXC cards offer higher capacities even than SDHC, starting at 64GB and going up to a theoretical maximum of 2TB. SDXC cards typically come with a UHS-1 speed rating.

You can only use SDXC cards in cameras that support them. This includes cameras from 2010 on.

The new XQD format is designed for high capacities and high data transfer speeds. So far, the professional-standard Nikon D4 and D4s are the only cameras to use this new card format.

It offers capacities in excess of 2Tb and potential transfer speeds of 125-500GB per second.