New 15" rMBP i7 1TB SSD 16GB - but 25GB dmg takes over 20 minutes to extract/verify

Discussion in 'MacBook Pro' started by patent10021, Dec 26, 2014.

  1. patent10021 macrumors 68030


    Apr 23, 2004
    You know, the maxed one with 2GB GPU RAM.

    Is this normal? doesn't seem very "pro".

    I wrote 30 minutes but think this might get up to one hour!!!!
  2. yjchua95 macrumors 604

    Apr 23, 2011
    GVA, KUL, MEL (current), ZQN
    Is it an encrypted DMG? Do you have FileVault enabled?
  3. Serelus macrumors 6502a


    Aug 11, 2009
    The issue is sometimes not the speed of the computer, but rather the way in which the data is distributed across the file.

    If the dmg contains a lot of small files that need to be extracted this will take a long time, regardless of how fast the computer is.

    It's unlike copying a solid 25GB file which will go alot faster because it doesn't have to deal with processing each and every different little file that's being extracted.
  4. maflynn Moderator


    Staff Member

    May 3, 2009
    That's not normal, but if the DMG is encrypted, it can take longer then usual, how much, I have no idea
  5. Queen6 macrumors 604


    Dec 11, 2008
    Land of the Unexpected
    More likely just a few minutes and that would be for something very large. I would download the DMG again as it`s potentially corrupted/damaged.

  6. patent10021 thread starter macrumors 68030


    Apr 23, 2004
    The dmg wasn't corrupted. The contents are all the Apple loops etc that get installed into Logic Pro X. The dmg was created with the intention of saving an entire day waiting for the Logic additional content to download from Apple. 5GB for core content then another 40GB for additional stuff. The dmg is 25GB so that means all those packages blow up to about 40GB. But still it shouldn't have taken little under an hour to open that 25GB DMG.

    Attached Files:

  7. paolo- macrumors 6502a

    Aug 24, 2008
    I think it would have to do with the .DMG more than the computer. I'm not too familiar with the inner workings of .dmg or it's verification but your package is 40GB made up primarily of <1MB files. That might have something to do with it. I'm guessing the process has to work on each of those say 40 000 files individually. Just like copying several small files is much slower than copying a single large file.
  8. aquilc macrumors member

    Dec 26, 2014
    check if FileVault is turned on. It has been causing issues, including performance issues.

    If it is turned on, turn it off and see how the extraction goes.

    Did you try to extract the file on another MAC OS X computer?
  9. maratus macrumors 6502a


    Jun 12, 2009
    Why exactly do you need to verify an image? If you're opening a big DMG then skip verification unless you believe it could be corrupted. Also you shouldn't buy a computer because of "pro" written on it but only if the hardware matches your needs (it's not a secret which CPU / GPU / memory is used in rMBP)

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