为了保证刻写每一磁道伺服信息时的准确性，必须能够精确地控制伺服信息刻写磁头的运动以及定位。
In order to guarantee the accuracy of every servo track's writing, the movement and position of head, which is used to write servo, must be accurately controlled.
软损坏包括磁道伺服信息出错、系统信息区出错和扇区逻辑错误。
The soft damage included tracks serving information error, system information error and logical error of the sectors.
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