How do I Use my Old Hard Drive as a Portable Drive to Transfer and Back Up

Hi
Sorry if this is in the wrong place but I couldn't find another topic area.
So I recently upgraded my hard drive on my Macbook to a 300gb from an 80gb and now I want to use the 80gb as an external drive like a USB pen (it's already in an enclosure so I can plug it in via USB)
What I don;t understand is how I can clear the hard drive of the stuff I backed up from my computer and How i can keep updating the hard drive without the information on it being erased.
I am looking to be able to transfer movies and music from my brothers iMac to my Macbook and vice versa as well as storing some word documents on it.
Any help will be gravelly appreciated.
Thanks!

You should be able to do a complete reformat in Disk Utility. The utility calls this "erase" and gives you the choice of format. You might use MS-DOS (FAT32) if you want to swap files with PCs, but there a 4GB file limitation, which I've run across with large archived DVD images. Normally people use HFS+ if it's exclusively going to be used in the Mac enviroment.

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