You need to use a newer filesystem such as latest FFS in AmigaOS 3.5/3.9 or get hold of SFS or PFS filesystems.
Using FFS v40 is not advisable over 4GB as writing data over the 4GB limit will overwrite data at start of the drive!
http://www.xs4all.nl/~hjohn/SFS/http://on.to/greed
