Confused on the math?

[Juelie McLean]

I recently purchased an external 120GB (8MB) Seagate hard drive.  I 
wanted to use it to back up my iMac DV SE.  So the other night, I 
copied my iMac HD onto my external drive.  But the math doesn't add 
up?

My iMac says my HD capacity is 12.75GB and I still have 8.19GB available.

My external HD says capacity is 111.79GB, but after copying my iMac 
HD, it says I only have 39GB available.

If my iMac says I am using 4-5GB.....how did it come up to be over 
70GB when copied to the external drive?

My iMac HD is extended HFS+ and the external HD is standard HFS.  Is 
this somehow the difference?
When I initialized my external HD, did I do it wrong?

Any assistance on understanding this would be greatly appreciated!

Thanks,
--
                    Juelie McLean
  Olde World Santa Dolls by the Santalady
          http://www.santalady.com/
                      *{;o)}}}}}
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