你可以加参数 /x试试
/x=Scale to Fit – On FAT, FAT32, or NTFS file systems, selecting this option will make Image for DOS assume that the size of the original hard drive is based on the location of the end of the last partition; Image for DOS then applies the same scaling to the target hard drive. If any unpartitioned space existed at the end of the source drive, that unpartitioned space won’t exist on the target drive after you restore your image. This option has no effect on images restored to hard drives using other file systems. You cannot use this option in conjunction with the Scale to Target option. If you inadvertently enable both options, Scale to Fit will take precedence.