dd命令：做硬盤IO性能測試

一、dd複製轉換     1.dd：convert and copy a file 文件轉換和複製，複製操作底層(塊) DESCRIPTION：Copy a file, converting and formatting according to the operands.     2.用法：dd  [OPTION] if=/PATH/FROM/SRC   of=/PATH/TO/DEST   

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