Beg_offset - Starting offset into device, 0 for directory.
beg_offset-到设备的起始偏移量，对于目录是0。
Xiaowang has set up an anti-hacker device before starting the program.
程序启动前就已经预设了反黑客装置。
When the device is adopted, the starting time is shortened;
采用这种装置，开车时间短。
When the device is adopted, the starting time is shortened;
采用这种装置，开车时间短。
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