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=== SD Express Speed Class (E) === SD Express speed class ratings—E150, E300, E450, and E600—specify minimum sustained write speeds of 150, 300, 450, and 600 MB/s, respectively.<ref name="SDver9.1" /> These classes are represented by a stylized "E" followed by the number, enclosed in a rounded rectangle. They are designed for data-intensive applications such as large-scale video processing, real-time analytics, and software execution.<ref name="SDver9.1" />
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