New Mac User has question...RE .DMG files??

Discussion in 'Mac Basics and Help' started by wifeofpdx, Feb 6, 2009.

  1. wifeofpdx macrumors member

    Joined:
    Aug 20, 2008
    #1
    Example,

    I download a trial of iWork 09. I get it in my download folder as .DMG file.

    I click on that, and I get this "disk image" on my desktop, that I can eject.

    If I want to backup on dvd what I just bought, do I burn the .DMG file or the "disk image" on my desk top??

    Loving the mac overall!
     
  2. r.j.s Moderator emeritus

    r.j.s

    Joined:
    Mar 7, 2007
    Location:
    Texas
    #2
    The DMG. Think of it this way, the dmg file is a folder, when you open it a shortcut appears on the desktop and you can access the files in it.
     
  3. wifeofpdx thread starter macrumors member

    Joined:
    Aug 20, 2008
  4. r.j.s Moderator emeritus

    r.j.s

    Joined:
    Mar 7, 2007
    Location:
    Texas
    #4
    As a backup, yes.

    Especially since you can't burn a mounted disk to another volume.
     
  5. dukebound85 macrumors P6

    dukebound85

    Joined:
    Jul 17, 2005
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    5045 feet above sea level
    #5
    yea. think of a dmg like a zip file sorta
     
  6. wifeofpdx thread starter macrumors member

    Joined:
    Aug 20, 2008
    #6
    What do you mean, can't burn a mounted disk to another volume?

    I'm not sure I understand...
     
  7. ZMacintosh macrumors 6502a

    ZMacintosh

    Joined:
    Nov 13, 2008
    #7
    Usually, when you double click on a DMG file it mounts a virtual disk that runs the installer of the application.

    A mounted disk:
    [​IMG]

    taken from: http://www.ofzenandcomputing.com/zanswers/780
     
  8. wifeofpdx thread starter macrumors member

    Joined:
    Aug 20, 2008
    #8
    So what RJ was saying is that I couldn't burn the mounted disk on my desktop to a cd/dvd drive (another volume)?

    Leaving the only option for burning an install CD being to burn the .DMG file itself.

    Is that correct?

    Thanks for the reading below...just what I needed. Coming from a PC, there is nothing that I can relate.
     
  9. ZMacintosh macrumors 6502a

    ZMacintosh

    Joined:
    Nov 13, 2008
    #9

    Correct.

    Not to complicate it or anything, but look at it this way when you extract an Apple/Mac Application from its Disc (cd or dvd) it will extracted as a DMG essentially.

    so thats the type of file that will properly burn to CD/DVD medium.


    hope that helped some more.
     
  10. sammich macrumors 601

    sammich

    Joined:
    Sep 26, 2006
    Location:
    Sarcasmville.
    #10
    Hang on a second...a .dmg file is a 'virtual disk'. Therefore you can replicate this disk wholly onto another disk which fits all of the data contained in that .dmg.

    Open up 'Applications -> Utilities -> Disk Utility', drag your .dmg file (not the one you can eject) into the left hand side column (if it's not there already). Click 'burn' at the top of the window, and then insert a disk. Follow the drop down pane to burn.

    This process will burn to the CD/DVD the contents of that .dmg, so that when you insert the CD/DVD, it will look exactly like the downloaded .dmg would when you double clicked it.

    [​IMG]
     

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