I'm in the midst of backing up an external drive (to another external drive) via Firewire 800, which works fine, but for some strange reason one specific file won't be copied. It's an iDVD file with a filesize of 12.98 GB. All other files have been copied without any problems. When copying over to the backup drive all seems fine for a while, then (after having copied 4.01 GB) I hear some "clunking" sounds from the source drive followed by the error message shown below. I've tried copying the said file several times and to different backup drives, and in all instances the file copying stops at 4.01 GB. I've checked both drives with Disk utility and they check out fine. And the iDVD file opens fine in iDVD. Could it be that MacOSX needs some free "work space" on one or several of the drives in question, which isn't available? Cureently, the source drive has only 10.63 GB free space, the destination drive has 582 GB available and the computer's (1.67GHz Powerbook G4) internal 80 GB drive has 23 GB free space.