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Thread: Mounted DMG doesn’t grow in size automatically

  1. #1

    Default Mounted DMG doesn’t grow in size automatically

    I wanted to copy files into a mounted dmg but get always the error message that there is not enough space.
    I thought I could use a mounted dmg like a normal drive adding (as well as deleting) files.

    Are my settings wrong?

    (I created a “.dmg Read-write (can be modified)”, use a passphrase to encrypt it; I use 10.5.2)


    Greetings

    Hans

  2. #2

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    Each .dmg has a fixed capacity. With DropDMG, this is based on the size of the file/folder that you drop onto it. It will typically create the .dmg large enough to hold the source items, with a little bit of extra space so that you can add a background image or other small files. A future version of DropDMG will let you create a blank .dmg with a capacity that you choose. For now, you would need to do that using Disk Utility.

  3. #3

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    Michael, thank you very much for your quick reply.
    Now I think I understand how it works.
    I could create a dmg with – let’s say – a 500MB-file, delete this after the dmg was created and use the space to copy into the dmg as many files as I wanted to as long as their total sum doesn’t exceed 500 MB.
    Is this right?
    (If dmgdrop works this way then it would be fine with me!)

  4. #4

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    Quote Originally Posted by Hans View Post
    I could create a dmg with – let’s say – a 500MB-file, delete this after the dmg was created and use the space to copy into the dmg as many files as I wanted to as long as their total sum doesn’t exceed 500 MB.
    Correct.

  5. #5

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    Thanks again :)

  6. #6

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    Quote Originally Posted by Michael Tsai View Post
    Each .dmg has a fixed capacity. With DropDMG, this is based on the size of the file/folder that you drop onto it. It will typically create the .dmg large enough to hold the source items, with a little bit of extra space so that you can add a background image or other small files. A future version of DropDMG will let you create a blank .dmg with a capacity that you choose. For now, you would need to do that using Disk Utility.
    Hi Michael, Any update on this feature? I am interested in this and in a related feature, which is the ability to simply resize an existing dmg. (I couldn't find any information on resizing dmgs in the help, so I assume this feature isn't implemented.) I know this can be done via command line. I just downloaded DropDMG and was hoping this cute little program could take care of my other DMG needs as well. Thanks!

  7. #7

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    Quote Originally Posted by JayhawkBabe View Post
    Any update on this feature?
    It will be in DropDMG 3.0, which will be a free update for those who purchase DropDMG 2.8.5 today.

    Quote Originally Posted by JayhawkBabe View Post
    I am interested in this and in a related feature, which is the ability to simply resize an existing dmg. (I couldn't find any information on resizing dmgs in the help, so I assume this feature isn't implemented.) I know this can be done via command line.
    What are you trying to do, exactly? The hdiutil tool does have a resize command, but I haven’t found it particularly useful.

  8. #8

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    Quote Originally Posted by Michael Tsai View Post
    It will be in DropDMG 3.0, which will be a free update for those who purchase DropDMG 2.8.5 today.
    Oh goodie! Glad to hear it's still planned and that there's no reason to wait. Thanks.

    Quote Originally Posted by Michael Tsai View Post
    What are you trying to do, exactly? The hdiutil tool does have a resize command, but I haven’t found it particularly useful.
    I have a DMG that I want to add a number of files to, though the size is unknown as of right now. I was going to make the DMG large and then shrink it down once I am finished fiddling with it. I am a recent Mac convert from Linux, so I can rock the command line a little better than I care to talk about. I just don't know the Mac specific commands (eg hdiutil) very well and was trying to avoid a visit to the man pages. Cheers!

  9. #9

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    Quote Originally Posted by JayhawkBabe View Post
    I have a DMG that I want to add a number of files to, though the size is unknown as of right now. I was going to make the DMG large and then shrink it down once I am finished fiddling with it.
    OK, that is a case where the resize command would be useful. Another, perhaps easier, option would be to create a sparse image (so that the logical size can be large, while the physical size on disk only increases as-needed). DropDMG doesn’t currently support creating sparse images; that will also be added in 3.0.

  10. #10

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    Quote Originally Posted by JayhawkBabe View Post
    Any update on this feature?
    DropDMG 3.0 is now available and includes the ability to create new blank disk images.

  11. #11

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    Great! Thanks.

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