对微机硬盘常见故障进行了初步分析，包括：硬件电路故障、硬盘读、写故障、硬盘格式化等方面的故障。

This paper elementary analyses the familiar malfunction of hard disk of microcomputer. It includes hardware circuit malfunction, hard disk reading and writing malfunction, hard disk formation etc.

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读操作的完整硬盘寻道时间是 7.4 毫秒，而写操作是 7.9 毫秒。

The full disk seek time is 7.4 milliseconds for reads and 7.9 milliseconds for writes.

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因此，请求存储在内存中的数据的读事件不会访问硬盘。

Therefore, read events that request data already stored in memory don't generate a trip to the hard disk.

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Other signals move the read/write heads to read or write data on the platters.

其他的信号移动读写头,来到硬盘中去读或者写。

哈佛公开课 - 计算机科学课程节选