Can you see the external drive on the left pane of disk utility.
If so, you have a couple choices…
Go to the higher level item (should say something like "74.5GB ST###### 1A Media" - this is an example using my 2.5" 80G ext hard drive) and select "Partition" if you want to repartition and format the whole drive. Here you can select the number, size, name, and file system of the partitions. Should be fairly self-explanitory.
Alternately you can select any volume under the main heading for the hard drive (on the left pane) and select "erase" to format a single partition.
[edit] didn't see you there caribiner :thumbs up: [edit]
nice deal - how big is it? GB and is it a 2.5" or a 3.5"?
i've got two, both were loose HDs i had, one from a vaio desktop (3.5" 120G) and one from my old 17" HP laptop (2.5" 80G). found nice cheap-ish adaptec cases for both, though the 3.5" needs an external power supply, so i need two cables and it gets a bit warm.
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