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读卡器芯片直接决定速度上限，认准RTS5411/GL3224等USB3.2 Gen1主控，理论速度可达5Gbps；廉价USB2.0芯片(GL823)实际读写仅30MB/s左右，拷贝一张256G卡差几倍时间

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Unverified外接协议决定速度上限：USB 3.2 Gen2（10Gbps）实际读写约1000MB/s，USB 3.2 Gen2x2（20Gbps）约2000MB/s，雷电3/4（40Gbps）可达2800MB/s+，但需主机接口匹配，否则协议自动降速87% similar Unverified标称2000MB/s读取速度需要主机端支持USB 3.2 Gen2x2接口，目前大多数笔记本和台式机仅支持Gen2（10Gbps），实际速度会被限制在约1000MB/s左右86% similar Unverified读卡器实际速度还受电脑USB接口协议、数据线规格双重限制；用了标称20Gbps读卡器却配USB 3.0线材，速度依旧上不去，需确认线材支持对应带宽85% similar UnverifiedU盘选购认准USB3.2 Gen2（10Gbps）接口，实测读速≥300MB/s才算合格，标注USB3.0但读速仅100MB/s以下的多为主控缩水产品84% similar

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