Photography · Practical guide

Memory cards for cameras: capacity is only one part

Choose a camera memory card by supported format and recording requirements, then plan how you will back up its contents.

Check the camera manual before buying a card. The physical format, supported capacity and required recording speed all matter. A large capacity printed on the package cannot tell you whether a card supports your chosen video mode or burst settings.

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Read the camera's requirements

Find the card guidance for the exact mode you use. Still photographs, long bursts and high-data-rate video can have different requirements. Compare the specified speed class or approved-card information rather than a headline “up to” transfer rate alone.

Be cautious with unusually cheap cards from unclear sellers. Buy an identifiable model from a traceable supplier and keep the packaging and receipt. A card that appears to work briefly is not proof of sustained recording reliability.

Choose a manageable capacity

Several sensibly sized cards can separate sessions, while a larger card reduces changes during a long event. Neither arrangement is a backup. Estimate needs from your own files and leave headroom instead of relying on a generic number of photos.

Check that your card reader supports the format and connection on your computer. A suitable reader also makes it easier to copy files without keeping the camera connected.

Use a repeatable file routine

Copy the session to your working storage.
Verify an additional backup before reusing the card.
Format in the camera as its manual directs, only after checking copies.

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Camera memory card

Match the exact format and speed requirement in your camera manual. Compare trustworthy supply and warranty alongside capacity; a faster label is useful only where your setup benefits.

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Memory card reader

Check card format and your computer's port. A compatible reader is useful for regular imports, but an adapter chain should be verified before you depend on it away from home.