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Secure Digital (SD) cards are memory cards used extensively in portable devices, such as mobile phones, digital cameras, GPS navigation devices, handheld consoles, and tablets. It is a family of solid-state storage media.

The Secure Digital format includes four card families. The four families are the original Standard-Capacity (SDSC), the High-Capacity (SDHC), the eXtended-Capacity (SDXC), and the SDIO, which combines input/output functions with data storage. SDHC and SDXC are the most common.

SD cards are usually differntiated by their speed. Each card has a speed "class" indicating minimum performance to record video - both read and write speeds must exceed the specified value. Classes range from 2 up to 10, followed by U1 (which is the same speed as 10 but uses an updated connection type) and U3.

Featured SD Memory Cards

View all SD Memory Cards
SanDisk Ultra 32GB UHS-1 (U1) SD Card
Transcend 128GB SDXC Memory Card, U1, UHS-I, Class 10
SanDisk Extreme PRO 512GB Class 10 SD Card
SanDisk Extreme PRO 1000GB Class 10 SD Card

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Transcend (256GB) SDXC Memory Card U3 UHS-I

Transcend (256GB) SDXC Memory Card U3 UHS-I

£22.99 inc VAT