新手讨教：为什么镜像的时候会出现这个问题？

Image file:D:\Kalyway_10.5.2_DVD_Intel_Amd\Kalyway_10.5.2_DVD_Intel_Amd.iso
Type: iso/hfs.
File size:3927363584 Bytes
Image size:3927244799 Bytes
Driver h: not empty,try another!
Driver m: not empty,try another!

用的是硬盘安装助手，才格式化了硬盘。谢谢