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【单选题】
假设一个有3个盘片的硬盘，共有4个记录面，转速为7200r/min，盘面有效记录区域的外直径为30cm，内直径为10cm，记录位密度为250位/mm，磁道密度为8道/mm，每磁道分16个扇区，每扇区512字节，则该硬盘的非格式化容量和格式化容量约为(50)，数据传输速率约为(51)。若一个文件超出一个磁道容量，剩下的部分(52)。A.
120MB和100MB
B.
30MB和25MB
C.
60MB和50MB
D.
22．5MB和25MB
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