Memory Cards

Memory cards are a type of data storage device that are commonly used in portable electronic devices such as digital cameras, smartphones and other handheld devices.

There are numerous formats of memory card including SD (Secure Digital), MicroSD, CFast and CFexpress cards. These vary in dimensions and the type of slot required in a reader to transfer that data to a computer. SD Cards and MicroSD cards are segregated by their bus speed - either High Speed or Ultra High Speed (UHS) - this defines the maximum throughput speed of the card; UHS I or U1 - 104MB/s; UHS II or U2 - 312MB/s; and UHS III or U3 - 624MB/s.

These are further broken down into size groups - SDHC (High Capacity up to 32GB ), SDXC (Extended capacity up to 512GB) and Fast 2.0 (2nd generation up to 1TB). Cards are then usually given ‘classes’ based on their read and/or write speed performance.

Need help? Read our Memory Buying Guide
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