WD MyBook 500GB: capacity question


I am not the most technical person so when i purchased my new MyBook I did not re-format it to OS extended Journaled, I understand that MS-DOS (Fat 32) is acceptable for my powerbook but i have no future need to share the drive with a pc.

I have just bought a Seagate 320GB Expansion portable drive as I couldn’t get my hands on a WD portable soon enough for my needs, I have formatted that drive as OS Extended Journaled and all is fine, however when trying to use both Carbon Copy Cloner or Super Duper to clone my MyBook HD it tells me as it is formated as MS-DOS (Fat32) it will not run HFS+ files.

I have done the old drag and drop of all my files/folders I wish to keep including system files such as autorun, documentation, memeo, recycled, system volume information etc which i don’t know is necessary or not. My main problem is all the folders copy across fine by the look of things but I have 290.41GB on my WD MyBook and when copied over it is only showing 283.44 on my Seagate…I am wanting to re-format my MyBook to set up my time machine but don’t want to do it until I am sure all of my files are copied over…

Can anybody help please?

Many thanks for taking the time to read this.