Error -1309 when copying a file from internal to external HD

I am trying to copy a disk image of an iDVD project over to an external hard drive.
I want to transfer the file to my laptop which burns DVDs at 8x as opposed to the 2x of my iMac 20.
During repeated attempts, near the very end of the copying process, I get this error:
“Sorry, the operation could not be completed because an unexpected error occurred
(Error code -1309)”
I can find no reference to this error code number in Apple’s site or from a Google search.
I have verified and repaired permissions on the disk being copied from (the startup disk) and have verified the disk of the external (Western Digital 120GB).
I have also verified that the file in question plays correctly in DVD player on the iMac 20.
I have also tried copying other files to the external (including disk images) and they copy fine, which leads me to believe there is a problem with this particular file.
I can try re-creating the disk image again in iDVD, but because its almost a 2 hour program, it took most of the day to do that.
So before I take that step again:
can anyone please shed some light on what my problem could be, or ways to troubleshoot further? Thank you.

Can I reformat in Disk Utility?
Yes - keep in mind that reformating will erase anything on the drive.
From the Disk Utility Help files:
1. If you want to erase an external disk, connect the disk to your computer.
2. In Disk Utility, select the disk or volume in the list on the left.
3. Click Erase.
4. Choose a format from the Volume Format pop-up menu. Usually you will choose Mac OS Extended (Journaled).
5. Type a name for the disk or volume.
6. If you're erasing a disk and plan to use the disk with Mac OS 9, select the checkbox to install the Mac OS 9 drivers.
7. You do not need to install the Mac OS 9 drivers to use the disk with the Classic environment.
8. If you want to erase the entire contents of the disk by writing zeros, click Security Options, then select the option you want and click OK.
9. Click Erase.

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