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SD卡速度符号含义：C10=最低10MB/s；U1=10MB/s、U3=30MB/s；V30/V60/V90分别代表30/60/90MB/s最低持续写入

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UnverifiedSD卡速度标识含义：U3和V30均代表最低持续写入30MB/s，A1/A2应用性能等级针对随机读写（适合装APP运行），拍照录像看U/V等级，跑程序看A等级81% similar Unverified看SD卡标称速度时，UHS-I卡理论上限约104MB/s，即使标注U3/V30实际持续写入也难超90MB/s；需要更高持续速度必须选UHS-II卡（背面双排金手指）80% similar UnverifiedV90保证最低90MB/s持续写入，是目前SD卡中能稳定支持8K/4K高码率内录的少数选择之一，但价格远高于V60和V30卡77% similar

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