The technology principle, the check of USB disk, the modification of the boot sector of the USB disk and the file format modification are described.

从技术原理、USB设备的检测、对USB盘引导扇区部分的访问和修改以及对文件的格式修改等几个方面进行了阐述。

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Of course, all that data modification isn't of much value if you can't easily convert back into the textual format mentioned in this article. That's also trivial in JavaScript

当然，如果不能轻松地将对象转换回本文提到的文本格式，那么所有数据修改都没有太大的价值。

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Sheet image format, the author mainly use BMP format, just easy to read in the "drawing" behind software, sheet for modification of candidate number error.

答题卡图片格式笔者主要用BMP格式，那样方便后面阅卷时用“画图”软件，对考号出错的答题卡作修改用。

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