Splitting a Partition into smaller Volumes

Hi,
On an external drive I have 3 partitions. One of these is an empty 250gb partition. I'd like to split that into smaller 15gb sized partitions for some multiple install testing. In disk utility I have selected the partition and clicked the + sign to add a new one and so on until I had the rquired amount. I then selected new names and sizes (15gb) for each partition.
Firstly, it failed with this error "The chosen size is not valid for the chosen filesystem".
So, I decided to add one partition at a time. This worked. However, the 15gb partition is now only 9.46gb. A 5gb loss seems a bit excessive. Does this seem right?
Thanks

Thanks Steve. I figured that was the case. I must be doing something wrong (or my brain isn't working correctly today.) It seems that this should be a really easy thing to do - take one long segment, and break it into smaller segments. But I can't use anything in the clip menu, and the only way I figured out to save the individual clips as their own files is to delete everything else, and then save. Clip #2, select clip, delete everything, save. Seems kinda stupid to me. But, again I must be doing something wrong.

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afernandes wrote:
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http://discussions.apple.com/thread.jspa?threadID=2460925&tstart=0
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Splitting a Partition into smaller Volumes

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