alternate sector
备份扇区标识符 alternate sector identifier
以及当输入的密码字符串符合所述第一密码字符串时，则将所述硬盘的主开机扇区内的数据备份至一存储区域，并将所述主开机扇区内的数据删除。
When a first cipher character string is received, data in a main starting sector of the hard dick are copied to a storing area, and the data in the main starting sector are deleted.
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