SD cards have historically been associated with digital cameras, media players, game consoles, and other relatively simple and appliance-like devices. In these roles, the cards primarily needed to offer fast sequential read and write speeds, since they were typically just being asked to save and access one file at a time. But SD cards are becoming increasingly important as primary storage devices, use cases that demand better random read and write performance to account for multiple apps making small reads and writes to the cards in rapid succession.
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