error in copy recovery point

Hi,

 

I have a manual backup of my C: which is stored on a portable USB hard disk. I have tied to copy this backup point to a DVD disk, and got this error.

 

Error EC8F1F51: The copy process could not be completed. Error EC8F1F4F: Cannot copy image file. ErrorE7D1001F: Unable to write to file. Details: 0XE7D1001F

 

Can someone give me some help on this issue.