CHOICES IN ERASING EXTERNAL DRIVE

Hello everybody ... I am new on this forum trying to figure this one out:
I got 500 Gigs external hard drive (firewire and all) that is formated for "MS-DOS File system"
... and it shows on my desktop but it is not 500Gigs but 465 ONLY !!???
I know I will never get all 500 but only 465 ???
So I am thinking of erasing that disc with Disc Utility and getting free all the memory that is taken by manufacturer formating the drive as it is now.
... however when in Disc Utility on Volume format (where now says it is MS-DOS File System I have many choices like:
Mac OS Extended,
Mac OS Extended (Jornaled)
Mac OS Extended Case sensitive
Mac OS Extended Case sensitive Journaled
and
Unix
So which do I chose PLEASE !!!
Thank you
VMZ

Thanks for clarifying that Duane but he will still need to reformat for Mac OS.
I wasn't sure (not being terrific with math) but it seemed like it could have been bit much judging by my 160s. I figured after the re-format, if it was the same than that is what it was meant to be.
-mj
[email protected]

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