Can't Open my Backup DMG years of data gone

You should get about 2 Pages of text output from this command.

Also, I dont want you to mount the image.
The command will only attach the image, so that you then can eventually try to repair it using disk utility or Disk-warrior, or try to salvage files using Disk-warrior.

Please, if you dont want to post the whole ouput of the command
try again with
hdid /Path/to/image.dmg -nomount

The output shows, that no matching disk-image type can be found.

If this is a "Raw" image, then according to the output, its length must be a multiple of 512 bytes, which is not the case.

Question:
Is this a compressed image or an uncompressed image ?
meaning: The disk or partition you imaged, had this also a size of approximately 120MB ?

if the image is uncompressed, you can write it back to a disk or a partition (using the dd command in the terminal), regardless if its complete or not.
if its compressed, we should check, if there is something missing at the end or at the beginning and then try again to attach it.

Maybe, also check if its not something else:
"CUDIFDiskImage::setBackingStore unable to open resource fork (-4960)"


Assuming, this is not a Raw disk image,
but a compressed image:

- on what kind of filesystem is the image saved ( HFS+, HFS+ Case sensitive ... )?
- have you checked you have rights to read and write the folder containg the image and if you have read and write rights to the file ?

- dmgs do not need a resource-fork:
does this image has a resource fork ?
do a:
ls -l /Users/jasonbrennan/Desktop/MACPROBACKUP.dmg/rsrc
what is the output ?

maybe try to delete the resource fork and then retry mounting the image:
First, make a copy of the image to a safe location
then do a:
rm /Users/jasonbrennan/Desktop/MACPROBACKUP.dmg/rsrc
a question comes up like "override ....", press y
then again try to mount the image.

-------
When you did the imaging process, do you remember, what kind of image disk utility chose ?
During the imaging, have you observed that the process was finished sucessful ?

I tried a compressed disk diskimage, removed the resource-fork, and the image still mounted ok.

This is, how it should look:
<pre>
user% hdid tuxracer-0.61f\ copy.dmg -verbose -nomount
DIBackingStoreInstantiatorProbe: interface 0, score 100, CBSDBackingStore
DIBackingStoreInstantiatorProbe: interface 1, score -1000, CBundleBackingStore
DIBackingStoreInstantiatorProbe: interface 2, score -1000, CRAMBackingStore
DIBackingStoreInstantiatorProbe: interface 3, score 100, CCarbonBackingStore
DIBackingStoreInstantiatorProbe: interface 4, score -1000, CDevBackingStore
DIBackingStoreInstantiatorProbe: interface 5, score -1000, CCURLBackingStore
DIBackingStoreInstantiatorProbe: interface 6, score -1000, CVectoredBackingStore
DIBackingStoreInstantiatorProbe: selecting CBSDBackingStore
DIBackingStoreInstantiatorProbe: interface 0, score 100, CBSDBackingStore
DIBackingStoreInstantiatorProbe: interface 1, score -1000, CBundleBackingStore
DIBackingStoreInstantiatorProbe: interface 2, score -1000, CRAMBackingStore
DIBackingStoreInstantiatorProbe: interface 3, score 100, CCarbonBackingStore
DIBackingStoreInstantiatorProbe: interface 4, score -1000, CDevBackingStore
DIBackingStoreInstantiatorProbe: interface 5, score -1000, CCURLBackingStore
DIBackingStoreInstantiatorProbe: interface 6, score -1000, CVectoredBackingStore
DIBackingStoreInstantiatorProbe: selecting CBSDBackingStore
DIFileEncodingInstantiatorProbe: interface 0, score -1000, CMacBinaryEncoding
DIFileEncodingInstantiatorProbe: interface 1, score -1000, CAppleSingleEncoding
DIFileEncodingInstantiatorProbe: interface 2, score -1000, CEncryptedEncoding
DIFileEncodingInstantiatorProbe: nothing to select.
DIFileEncodingInstantiatorProbe: interface 0, score 900, CUDIFEncoding
DIFileEncodingInstantiatorProbe: selecting CUDIFEncoding
DIFileEncodingNewWithBackingStore: CUDIFEncoding
DIFileEncodingNewWithBackingStore: instantiator returned 0
DIFileEncodingInstantiatorProbe: interface 0, score -1000, CSegmentedNDIFEncoding
DIFileEncodingInstantiatorProbe: interface 1, score -1000, CSegmentedUDIFEncoding
DIFileEncodingInstantiatorProbe: interface 2, score -1000, CSegmentedUDIFRawEncoding
DIFileEncodingInstantiatorProbe: nothing to select.
DIDiskImageInstantiatorProbe: interface 0, score 0, CDARTDiskImage
DIDiskImageInstantiatorProbe: interface 1, score 0, CDiskCopy42DiskImage
DIDiskImageInstantiatorProbe: interface 2, score -1000, CNDIFDiskImage
DIDiskImageInstantiatorProbe: interface 3, score 1000, CUDIFDiskImage
CRawDiskImage: data fork length 0x000000000011DA57 (1170007) not a multiple of 512.
DIDiskImageInstantiatorProbe: interface 5, score -100, CRawDiskImage
DIDiskImageInstantiatorProbe: interface 6, score -100, CShadowedDiskImage
DIDiskImageInstantiatorProbe: interface 7, score 0, CSparseDiskImage
DIDiskImageInstantiatorProbe: interface 8, score 0, CSparseBundleDiskImage
DIDiskImageInstantiatorProbe: interface 9, score -1000, CCFPlugInDiskImage
DIDiskImageInstantiatorProbe: interface 10, score -100, CWrappedDiskImage
DIDiskImageInstantiatorProbe: selecting CUDIFDiskImage
DIDiskImageNewWithBackingStore: CUDIFDiskImage
DIDiskImageNewWithBackingStore: instantiator returned 0
DI_kextWaitQuiet: about to call IOServiceWaitQuiet...
DI_kextWaitQuiet: IOServiceWaitQuiet took 0.000025 seconds
2007-11-05 21:38:45.475 diskimages-helper[2701:2417] -serveImage: attaching drive
{
autodiskmount = 0;
"hdiagent-drive-identifier" = "E37156E8-1353-4C37-BBF6-08AF2753DA20";
"unmount-timeout" = 0;
}
2007-11-05 21:38:45.489 diskimages-helper[2701:2417] -serveImage: connecting to myDrive 0x00003707
2007-11-05 21:38:45.490 diskimages-helper[2701:2417] -serveImage: register _readBuffer 0x0x477000 with myDrive 0x0x0
2007-11-05 21:38:45.491 diskimages-helper[2701:2417] -serveImage: activating drive port 0x0x3807
2007-11-05 21:38:45.497 diskimages-helper[2701:2417] _serveImage: set cache enabled=TRUE returned SUCCESS.
2007-11-05 21:38:45.497 diskimages-helper[2701:2417] _serveImage: set on IO thread=TRUE returned SUCCESS.
2007-11-05 21:38:45.503 diskimages-helper[2701:2417] -serveImage: starting server loop - myPort is 0x0x3807
/dev/disk2 Apple partitionscheme
/dev/disk2s1 Apple partitionmap
/dev/disk2s2 Apple_HFS
</pre>

Strange.
Have you tried disk-utilities "verify" function for the image ?

The resource fork of a disk image seems only to be exist for compatibility reasons with pre 10.1 systems. It normally is not used any more.

I dont think, that you can just use dd to copy back the file, because it then must have at least the size of the partition. AFAIK the term "compression" means here that unused parts of the filesystem are not stored in the image. Real compression would mean an image compressed with bzip2.

Maybe, the error message about the resrouce forks is, because the dmg is corrupt/incomplete and the diskimage-Framwork is unable to locate the resourcefork inside the image.
-----
There is another command:
hdiutil info xyz.dmg

That should give you information about a disk image.
If this works, you would at least know, what kind of image this is.

sorry for that typo:
hdiutil imageinfo xyz.dmg

Of course you could try dd to write back the disk - better then nothing.
But better get a new disk, dont overwrite your running system.

I dont have an iChat account, but its certainly not difficult to register one.
But I think explaining dd here will do.

but try the imageinfo again.

My plan:
you can convert an image with hdiutil to an image with 2 forks, one data, one resourcefork. If it is possible to do this, you then probably could try to zap the resourcefork and then mount the data.
That way you would loose nearly nothing (only fonts, applications, no movies, music, photos, documents)


edit:
i recovered my unused aim account: nobodyloopback

Message was edited by: nobody loopback

Remember me from the start of this post? I'm still here rooting for you. I unfortunately haven't had anything to offer so I observe from the bg. I've learned from your dilemma. Hang in there, bro. You'll crack it!