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Speed Class | SD Association
Definition of SD card classes | PCMag
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C-GO3 - SD Card - Which card to use | Yuneec-Forum.com - Q500, Typhoon and Breeze Discussion Forum
Speed Class | SD Association
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Markings: speed, size and class | Understanding microSD and SD cards: speeds, markings and more | Adafruit Learning System
Buyer's guide: Getting the right microSD card - HardwareZone.com.sg
Understanding the Labels on Memory Cards | Integral Memory
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New SD card specs tout 128TB max, up to almost 1GB per sec - CNET
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