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Markings: speed, size and class | Understanding microSD and SD cards: speeds, markings and more | Adafruit Learning System
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Amazon.co.jp: Aeuln Micro SD Card, 128GB Micro SD Card with SD Adapter, U3 High Speed Class 10 UHS-I microSD Memory Card 4K UHD Video Shooting Micro SD Card Dash Cam Action Camera
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SD card - Wikipedia
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microSD and SD Card Buying Guide | TechSpot
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スピードクラス | SD Association
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Speed Class | SD Association
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