[thopok]

This is caused by the format on the destination hard drive. Western Digital pre-formats external hard drives in a FAT32 File System. This File System is recognized by most computer operating systems, but has a 4 GB file transfer and creation limitation. This means you cannot create a file or transfer a file or group of files larger that 4GB to the hard drive.
Resolution:
If you are running Windows 2000 or Windows XP, you can delete the partition on the drive and reformat the drive with the NTFS File System. NTFS File System does not have this limitation.
Important: Deleting or formatting a partition or volume will erase the data on that partition or volume.
WARNING: FAILING TO SELECT THE CORRECT DRIVE MAY CAUSE PERMANENT LOSS OF DATA ON YOUR OTHER HARD DRIVE(S)!