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之前用镁光SSD,现在换了rMBP,用blackmagic disk speed test测出来读写都在好几百M,为毛内部拷贝黏贴却只有70M/s左右呢?之前用firewire800的硬盘,现在用USB3.0的硬盘,还有一个UHS-1的SD卡,还有一个MLC的DIY U盘(测速读写都在200M/s左右)速度也都是70M/s,这是为何?