.dmg files on Snow Leopard guest
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.dmg files on Snow Leopard guest
I hope this question hasn't been asked already, but i certainly could not find it on the forum.
I am trying to mount a .dmg file for my Snow Leopard 10.6.2 guest, but virtual box keeps giving me this error:
Failed to open the CD/DVD image C:\Users\[...].dmg.
Could not open the medium 'C:\Users\[...].dmg'.
VD: error VERR_VD_DMG_INVALID_HEADER opening image file 'C:\Users\[...].dmg' (VERR_VD_DMG_INVALID_HEADER).
Result Code: E_FAIL (0x80004005)
Component: Medium
Interface: IMedium {53f9cc0c-e0fd-40a5-a404-a7a5272082cd}
Callee: IVirtualBox {c28be65f-1a8f-43b4-81f1-eb60cb516e66}
I was able to mount a previous .dmg file successfully in virtualbox and it ran well in the Mac guest.
Why doesn't this one work and how can i fix it?
Thanks in advance.
I am trying to mount a .dmg file for my Snow Leopard 10.6.2 guest, but virtual box keeps giving me this error:
Failed to open the CD/DVD image C:\Users\[...].dmg.
Could not open the medium 'C:\Users\[...].dmg'.
VD: error VERR_VD_DMG_INVALID_HEADER opening image file 'C:\Users\[...].dmg' (VERR_VD_DMG_INVALID_HEADER).
Result Code: E_FAIL (0x80004005)
Component: Medium
Interface: IMedium {53f9cc0c-e0fd-40a5-a404-a7a5272082cd}
Callee: IVirtualBox {c28be65f-1a8f-43b4-81f1-eb60cb516e66}
I was able to mount a previous .dmg file successfully in virtualbox and it ran well in the Mac guest.
Why doesn't this one work and how can i fix it?
Thanks in advance.
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Re: .dmg files on Snow Leopard guest
Mounting .dmg files is not a feature in VB. If you happen to have been able to mount them previously, then you were either lucky or it was actually another file.
If VB does support .dmg files (manual doesn't mention it), then the dmg file you got is dmged.
If VB does support .dmg files (manual doesn't mention it), then the dmg file you got is dmged.
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Re: .dmg files on Snow Leopard guest
so if i did just get lucky with my first .dmg that worked, what is the best way to go about converting a .dmg to .iso? Assuming the .dmg that i have isn't damaged...
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Re: .dmg files on Snow Leopard guest
Yes.
Read the Forum Posting Guide before opening a topic.
VirtualBox FAQ: Check this before asking questions.
Online User Manual: A must read if you want to know what we're talking about.
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Try searching the forums first with Google and add the site filter for this forum.
E.g. install guest additions site:forums.virtualbox.org
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VirtualBox FAQ: Check this before asking questions.
Online User Manual: A must read if you want to know what we're talking about.
Howto: Install Linux Guest Additions
Howto: Use Shared Folders on Linux Guest
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Re: .dmg files on Snow Leopard guest
So what is the best way to convert .dmg to .iso? do you have a preferred program?
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Re: .dmg files on Snow Leopard guest
I'm not a Mac user (I prefer to stay away from those things), so you have to ask Google that question. I'm sure it knows the answer.
Read the Forum Posting Guide before opening a topic.
VirtualBox FAQ: Check this before asking questions.
Online User Manual: A must read if you want to know what we're talking about.
Howto: Install Linux Guest Additions
Howto: Use Shared Folders on Linux Guest
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Try searching the forums first with Google and add the site filter for this forum.
E.g. install guest additions site:forums.virtualbox.org
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VirtualBox FAQ: Check this before asking questions.
Online User Manual: A must read if you want to know what we're talking about.
Howto: Install Linux Guest Additions
Howto: Use Shared Folders on Linux Guest
See the Tutorials and FAQ section at the top of the Forum for more guides.
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Re: .dmg files on Snow Leopard guest
You don't say if your host is Mac or otherwise. On a Mac you can just change the extension from .dmg to .iso. iso to dmg also works.benneese wrote:So what is the best way to convert .dmg to .iso? do you have a preferred program?
This has worked on all my Macs that I've had over the years. But, I have to say I don't have a Mac Guest to experiment with.
-Daniel
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Re: .dmg files on Snow Leopard guest
benneese wrote:So what is the best way to convert .dmg to .iso? do you have a preferred program?
From the command line, you can use hdiutil:
Code: Select all
hdiutil convert /path/to/image.dmg -format UDTO -o /path/to/new_image.iso
Note that this is probably a false positive---changing a file extension does not magically transform the format of the data the file contains.theDaniel wrote:You don't say if your host is Mac or otherwise. On a Mac you can just change the extension from .dmg to .iso. iso to dmg also works.benneese wrote:So what is the best way to convert .dmg to .iso? do you have a preferred program?
This has worked on all my Macs that I've had over the years. But, I have to say I don't have a Mac Guest to experiment with.
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Re: .dmg files on Snow Leopard guest
I've cut my computing teeth on the Mac platform and this is common practice in the Mac community. Changing a file extension may not work with every file, but usually the Mac works in the background changing the type, unseen by humans.Sharpie wrote:Note that this is probably a false positive---changing a file extension does not magically transform the format of the data the file contains.
You may be right, it may be that Apple in recent releases, trying to lure more Windows users, has changed the Mac's ability to do this.
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Re: .dmg files on Snow Leopard guest
I just figured this out for a read/write dmg. You can use Disk Utility or hdiutil to convert a dmg to a read/write image. Once you have a read/write image you can use VBoxManage to convert it to a vmdk. A read/write image creates a file the size of the disk the image was created from so you will need a volume 2x the size of the original disk.
In Terminal.app enter:
The reason this works for a read/write image is that a read/write image is a raw block copy of the entire disk. I have only tried this for a full disk with a partition map. I don't know how it will work for a volume image.
When this worked for you it must have been a read/write image.
In Terminal.app enter:
Code: Select all
VBoxManage convertfromraw sourcefilename.dmg destfilename.vmdk --format VMDK
When this worked for you it must have been a read/write image.
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Re: .dmg files on Snow Leopard guest
Thanks Mino, This is great to know.
But, shocking that the developers would integrate such a useful feature, even if it is through the CLI!
Disk Utility.app makes several read/write disk images. The two I make use of every now and then are the one you mention, the read/write .dmg, and the CD/DVD Master. The latter has an extension of .cdr. A .cdr disk image can be used sometimes to trick the occasional application that requires a physical CD.
But, shocking that the developers would integrate such a useful feature, even if it is through the CLI!
Disk Utility.app makes several read/write disk images. The two I make use of every now and then are the one you mention, the read/write .dmg, and the CD/DVD Master. The latter has an extension of .cdr. A .cdr disk image can be used sometimes to trick the occasional application that requires a physical CD.