如果仅仅使用文件复制指令，在文件大小超过磁盘容量时，就会出现错误。
If you just use the command of copying files, it will be mistakes that the size of the file is larger than the capacity of the disk.
如果我们使用原来的方法，为了增加内存的容量，地址段以及指令必须比16位更长。
In order to increase the number of memory locations, the address fields and hence the instructions must be longer than 16 bits if we use the same approach.
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