1.直接移动文件到目标地点
2.删除virtualbox中源vdi文件的配置
File -> Virtual Media Manager -> Release the vdi file -> Remove the vdi file
3.重新添加vdi文件
Machine -> Setting -> Storage -> Controller: SATA (click the right button to choose existing disk )
4. All done
参考文章：
VirtualBox Cannot register the hard disk already exists