RAM和ROM据我理解根本不是完全对立的两种存储。 Read Only Memory 是指易读不易写,写入电压要求较高。老式光盘刻录是CD-ROM,磁头指向固定的位置才能读取区域数据,即为非随机存储。U盘属于flash存储,归在ROM下面,NOR Flash满足随机存储。NAND Flash不可以随机存储。 More @Wikipedia
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