Splitting up a single DMG file?

Discussion in 'MacBook Pro' started by Vegeta-san, May 7, 2007.

  1. Vegeta-san macrumors 6502

    Aug 4, 2006
    I'm shipping off my MBP to Apple shortly, and I'm thinking of backing up by making one DMG file of my entire hard drive. Unfortunently, I have nothing that can hold a single 150 GB DMG partition, so is there any way to split one DMG into several pieces that will recombine themselves when needed? Thanks.
  2. SC68Cal macrumors 68000

    Feb 23, 2006
    the command line utility hdiutil supports segmenting.

    From hdiutil's manpage:

               hdiutil segment -segmentSize 10m -o /tmp/aseg 30m.dmg
                   creates aseg.dmg, aseg.002.dmgpart, and aseg.003.dmgpart
  3. Max Payne macrumors 6502a

    Oct 27, 2006
    Brisbane, Australia
    Thank you... I always had the thought of the possibility of splitting image files.
  4. Samwise592 macrumors regular

    Feb 4, 2007
    Long Island, NY
    well, i know toast 8 will let you span a file across discs... it works cross-platform too...

  5. RedTomato macrumors 68040


    Mar 4, 2005
    .. London ..
    How much is your data worth?

    You can buy an external 200 GB ready-to-go external drive very cheaply these days ($70 odd for USB 200 gig). If you can afford a MBP, you can afford one of these.

    You should be taking regular backups anyway. If you're busy, get a 200 gig usb and make a DMG image.

    If you're poor, i.e. not busy and have spare time, then backup important info (My Documents, Library/Mail, etc) onto DVD. Not every one of the 160GB on your drive is worth backing up.
  6. SC68Cal macrumors 68000

    Feb 23, 2006
    Usually if you just back up your home folder, that allows you to move it between computers.
  7. Vegeta-san thread starter macrumors 6502

    Aug 4, 2006
    I'm sorry, but what is this? I have no idea what to do with this except open Terminal and throw it in....What is "hdiutil manpage"? Please explain this to me like I am the most noob noob you know. Thanks.
  8. quigleybc macrumors 68030


    Jun 17, 2005
    Beautiful Vancouver British Columbia, Canada

    i wish they were that price where I live :(
  9. cp1160 macrumors newbie

    Feb 20, 2007
    Splitting up a DMG File

    I've not used it but I believe the application DMG Converter has a Segment option that would provide a GUI interface for segmenting a DMG file. It can be located on VersionTracker.
  10. xUKHCx Administrator emeritus


    Jan 15, 2006
    The Kop

    just segmented a dmg (pretty useful for moving around large files on my 1 Gb USB drive) although for the original OP this may not be an option as you need something big enough to store the 160Gb dmg on first.
  11. Shadyriley macrumors 6502

    Mar 27, 2009
    Ok i just split up a 525mb .dmg file into 3 different parts around 175mb each using DMG Converter. When I move them to my new computer how to i combine them back up?
  12. netracer macrumors newbie

    Mar 26, 2009
    Why don`t you try machacha, the mac version from windows' Hacha. Supeasy and fast program to cut and join files. Specialy recomended (hacha it's the spanish word of "axe")
  13. Shadyriley macrumors 6502

    Mar 27, 2009
    I couldn't find it. Any other recommended resources tobind my 3 segmented .dmg files back into one? How to make humpty dumpty whole again?
  14. p.luik macrumors regular

    Jan 18, 2008
    Faribault, MN
    Mount the images, make a new dmg with all the files combined.
  15. sushi Moderator emeritus


    Jul 19, 2002
    This looks cool.

    BTW, do you know of a Windows XP counterpart to this?
  16. Shadyriley macrumors 6502

    Mar 27, 2009
    how do i "mount" the images and make a new dmg?

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