External HD full, but its not!

[Shamrock]

I have a seagate 160gb external drive. I'm trying to move some large files across to save space on my other hdd's, but as I do it says it's full, despite having 80gb free.

What would cause this?

 

[Shamrock]

Thanks, that must be why. It's FAT32 and the files are above 4gb.

I can't really reformat it as NTFS because I have nowhere to store the files in the meantime!

 

[Shamrock]

Sorted

Thanks guys.