create image时 copy data是什么意思？

如下图,  Copy Data具体说明含义呢 ？  

Name	Enter a name for the image.
Description	Enter a brief description of the image.
Image Source	Choose the image source from the dropdown list. Your choices are Image Location and Image File.
Image File or Image Location	Based on your selection, there is an Image File or Image Location field. You can include the location URL or browse for the image file on your file system and add it.
Format	Select the image format.
Architecture	Specify the architecture. For example, i386 for a 32-bit architecture or x86_64 for a 64-bit architecture.
Minimum Disk (GB)	Leave this field empty.
Minimum RAM (MB)	Leave this field empty.
Copy Data	Specify this option to copy image data to the Image service.
Public	Select this option to make the image public to all users.
Protected	Select this option to ensure that only users with permissions can delete it .

楼主贴出来的是不是缺数据，他是什么选项。
大意应该是复制镜像到镜像服务

这个就是创建镜像时候的选项。 copy data 目的和意义不明