Can't move 6.5GB file to MyBook

Hey.

I'm trying to move a backup folder of 6.5GB (1 ISO file inside) and it gives me an error which I can't seem to solve.

On lighter files it works fine.

What can I do?

Thank you!

Re-format your MyBook to use the NTFS file system. The FAT-32 file system is limited to files no larger than ~4 Gb.

Regards.

Or if you don't plan on sharing the drive with Windows computers, then format it to Mac OS Journaled as OS X has an issue with writing to NTFS partitions.