MAC OS extended journaled hard drive: does it need defragmentation?

Hi,
i have a 2TB external hard drive (A) upon which i have 1.5TB  of image and video files
I am goimg to be seperating out the video files (approx 1Tb)  and transferring them to another hard drive (B) leaving lots of little gaps across this drive where the old files previously existed.
Is the operating system   "MAC OS extended journaled" one which, for want of a better term, a format that "self-defragments" itself, thus ensuring that  drive A provides me with the full capacity after the move of the video files as MAC comptuers do?   Or do i have to perform some form of manual intervention either running a version of a "de-frag" programme on the hard drive, or transferring the data across to another drive and re-formatting Drive A and starting from the beginining?
Thanks

Mac drives do not need to be defragmented manually.  I don't think it's so much that they 'self-defragment' as it is that they store data efficiently in the first place, but no intervention is necessary.
You should just take this as a general rule.  OS X is designed to be maintenance-free.  There's nothing you need to do at the system level unless you're seeing some sort of odd behavior, and even that is generally corrected by a simple restart.  It doesn't generally hurt to do manual maintenance, but to my mind something like defragmentation consumes a lot of time and introduces a risk of error, while providing negligible gains in performance.  Not a favorable cost/benefit ratio.

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    Please advise best way to handle this situation.
    Thanks!

    If you are certain the only problem is that the startup volume is not Mac OS Extended "(Journaled)" you may be able to fix this with Disk Utility: Select the volume in the list, then press command + j or select "Enable Journaling" from Disk Utility's File menu.
    However, the reason the Snow Leopard installer may not allow the install is because the drive must be formatted with the *GUID Partition Table* Partition Map Scheme. If you, you will have to reformat the drive. To determine the Partition Map Scheme, select the drive (not the volume name indented below it) in Disk Utility & look at the last line of info in the window.

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