What do all those microSD and SD card numbers and letters mean?
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SD and microSD Card Symbols and Naming Patterns Explained
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What do all those microSD and SD card numbers and letters mean?
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MicroSD Cards Explained
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Markings: speed, size and class, Understanding microSD and SD cards: speeds, markings and more
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SD card - Wikipedia
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MicroSD cards: sizes and speeds at a glance, , MicroSD cards: sizes and speeds at a glance