How to reformat a used dvd disc

Hi
  I have a MacBook and the installed programs and dvd drive. If I burn a dvd movie, how can I reformat and delete that info in order
to reuse the dic afterwards.
Thanks
Phil

Well it has to be a DVD-RW (Re-Writable), as DVD-R is only able to write once.
http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh6.html

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    A man should convert his anger and sadness into strength to continue living in this life.

    Hi,
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    The number of my computer is : LM610EA#A2N.
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    My HP lapotp is well-cared, as opposed to my sister's Inspiron Dell laptop,
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    SOFTWARE\LightScribe\LSPrintAPI C:\Program Files
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    SYSTEM\CurrentControlSet\Services\LightScribeService\Start
    2
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    0
    SYSTEM\CurrentControlSet\Services\LightScribeService\
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    SYSTEM\CurrentControlSet\Services\LightScribeService\ObjectName
    LocalSystem
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    Then, I found that the problem solved and all discs became being read
    normally. Aslo, optical drive became installed on BIOS]]]
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    How much does it cost?
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    When I import my Sony video, which is in m2ts format, the file size is a few times larger.  This affects the volume of clips for creating the blu-ray or DVD discs.  How can I squeeze the file size without sacrificing the quality of output?  Is there any other ways of achieving this?

    wongrayd wrote:
    Thanks.  I do not have the experience on burning discs from iMovie for the movie after editing (ie for video discs players).  It seems that i cannot find the relevant command in the tool bar for this purpsoe.  Would you please show me the way?
    The command is gone because iDVD has been discontinued by Apple. After Apple discontinued iDVD they removed the iDVD burning link from iMovie. I still use iDVD sometimes, only because I have an old copy.
    wongrayd wrote:
    You have mentioned about Handbrake as a converter.  What is the RF no. (under Constant Quality) meant?  It seems that the smaller the no. is, the better quality will be.  What is the optimal no.? or should we use the Average Bitrate? Again, what is the best rate?  Furthermore, which format is more suitable or the best: H264 or mpeg 2/4?
    I don't know what RF means. When I have used HandBrake, I've used presets that apply to what I want to do, so I don't know the meaning of each individual setting. However, it appears that many of them are listed in the HandBrake User's Guide that is linked from the Help menu in the program:
    https://trac.handbrake.fr/wiki/HandBrakeGuide
    wongrayd wrote:
    For iMac, except iMovie, what other software is the best for the amateur?  I have read Photoshop.  Can this support m2ts files and user friendly?
    Photoshop is not amateur-level software, and although it can edit a video, it cannot burn a DVD. Unfortunately, because I still use iMovie, I haven't tried anything else. You might want to read the reviews of various DVD-burning applications in the Mac App Store.
    And maybe another forum member will jump in and help us here!

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