Norton Ghost 15.0 back up error

Hello:

 

Whenever I try to run a backup I receive the following error:

 

Error EC8F1C50: Cannot create file backup for job: File Backup.  Error E7D1001E: Unable to read from file.   Error EBAB03F1: The request could not be performed because of an I/O device error.  Error E4BC0004: Unable to backup file

{enter file name here} - the file name varies. 

 

Details: Source: Norton Ghost

 

I am running Norton Ghost Version 15.0.1.36526 and am  saving the backup to an external hard drive.

 

It worked fine for a a few months and the last successful backup was on 4 Feb 12.  Since then I have been receiving the above message.

 

Thanks,


Bruce