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Can't Open my Backup DMG years of data gone

44341 Views 85 Replies Latest reply: May 4, 2008 12:08 PM by romarcin RSS
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The Shad Guy Level 3 Level 3 (655 points)
Currently Being Moderated
Nov 4, 2007 9:20 AM
Okay I'm going to try to describe this in as much detail as I can and hopefully someone out there can help. I'm using a Mac Pro that has one harddrive in it, 250gb. I also have a Macbook Pro. I also have an external USB drive that's 250gb, and it's partitioned in 2 parts, on is about 200 and the other is 50. I can NOT boot from this drive.

A couple of days ago I decided I would back up my Mac Pro in anticipation of Leopard. So I booted into the Tiger Install disc that came with my computer, and used the disc utility to create a restore image of my entire Harddrive, using the default settings. The image is saved to my external drive.

I got Leopard on Friday and installed it using a clean instal, erasing everything on my computer and installing it fresh. The install went fine and Leopard works magically on this machine. I decided it was time to start bringing my files over from my image I had created, so I attached my drive and opened the DMG, but it wouldn't open, giving me error -4960. PANIC ENSUED. I also tried to mount it on my MacBook Pro which is still running Tiger and I got the same error!

The next day (yesterday) I called Apple, and the man I spoke with told me the reason why it won't mount is because its a raw restore image and what I'll have to do is restore it using the disk utility again. That made sense to me. This morning I tried restoring the image with both the Leopard utility and the Tiger one as well (booting off the install DVDs, that is), but no matter what I do, I get the same error -4960!!

So at this point I'm basically shattered. I live on my computer, it's my whole life (I know that may sound sad haha but it's the truth). This is like having my house burn down, and on top of that, the IRONY of the situation is just too much. The whole reason for upgrading is to get Time Machine.. Ugh. Anyway, Im starting to run out of ideas here. I think maybe it could be because my external drive is a piece of crap or something, so I'm currently copying the thing over to my internal drive and I'll try that. Other than that, I'm thinking the image must be corrupt or something, does anybody know any hardcore tools that could be used in such a situation? Any terminal-fu that could possibly fix this whole problem? I did use data recovery software on the drive yesterday and managed to get a few things, I think,, but I havent really looked through them and it's really not the same as having the files themselves, you know? But I guess it's something.

So yeah, if ANYONE has any ideas on what to do, you have no idea how thankful I would be to hear it.

Jason
touch fuzzy, get dizzy
  • MJWeb Level 1 Level 1 (125 points)
    Currently Being Moderated
    Nov 4, 2007 10:06 AM (in response to The Shad Guy)
    I'm very sympathetic to your situation and have been investigation error -4960 for you. These aren't specific answers but they might point you in the right direction, on your own, or communicating with Apple. Both of these, though unrelated, suggest the problem and solution is related to the User account. Just a hunch, but I'd try opening the DMG from your Guest Account. Keep bugging Apple, too!

    http://docs.info.apple.com/article.html?artnum=93311

    http://www.tech-archive.net/Archive/Mac/microsoft.public.mac.office.entourage/20 05-02/0052.html
    MBP C2D Glossy - 160/2 GB - 1.5 TB - Dell 2407 - Samsung 4661F - Logitech Z5500, Mac OS X (10.5), XP Pro/Boot Camp (deleted) - iLife/iWorks 08 - CS3 - Nano Video 8GB
  • nerowolfe Level 6 Level 6 (13,070 points)
    Currently Being Moderated
    Nov 4, 2007 10:20 AM (in response to The Shad Guy)
    Have you access to another Tiger box? Perhaps you could access your .dmg image from that?
    Whatever you do, do not modify or lost that image. There is some way to reclaim the data - just a matter of time.
    Dual G5(Leopard), MacBookPro 15, MacBookPro3,1 17 Core2Duo, Mac OS X (10.5), BC1.4 Vista Ultimate 64-bit on MBP/17"
  • Charles E. Flynn Level 4 Level 4 (1,875 points)
    Currently Being Moderated
    Nov 4, 2007 11:36 AM (in response to The Shad Guy)
    Before you tried to restore the image, did you select it in Disk Utility and choose "Scan Image for Restore" from the Images menu?
  • nerowolfe Level 6 Level 6 (13,070 points)
    Currently Being Moderated
    Nov 4, 2007 11:59 AM (in response to The Shad Guy)
    The Shad Guy wrote:
    okay, I just tried that from the Leopard installer disk utility and it says it's unable to scan, Error -4960. I tried several other options from the Images menu, they all failed and gave me the same error.

    When booted into OS X, I used the Disk Utility and tried a few things, looking at the log it says:
    [DUDiskController viewablePartitions] expecting DUDisk, but got nil

    Which leads me to believe something in the dmg fileheader is missing (I don't know how this all would have happened. When I made the image in the first place, it worked without error!). I'm a Computer Science student, does anybody know where I can find any solid information about the DMG format? Does Apple provide a spec or anything?

    Also, both DiskWarrior and Pacifist failed to open the file. What about using dd (the unix utility) to restore it? I'm thinking that would not work... Thoughts?


    Has Apple support been helpful? They have lots of tools at their disposal. If the dmg is corrupted, as you note it might be, most of the data are still recoverable. I am sure that somewhere at Apple they have dmg extraction tools for exactly this purpose.
    I assume the dmg is quite large, but might it be possible to burn it to a bunch of DVDs?
    Also, if you right click the dmg and select "get info" does the size seem reasonable?
    Dual G5(Leopard), MacBookPro 15, MacBookPro3,1 17 Core2Duo, Mac OS X (10.5), BC1.4 Vista Ultimate 64-bit on MBP/17"
  • nerowolfe Level 6 Level 6 (13,070 points)
    Currently Being Moderated
    Nov 4, 2007 1:12 PM (in response to The Shad Guy)
    If Apple can't help, there are companies that deal specifically with data recovery from HDs - even those that have been reformatted; they are usually quite expensive, but most likely, worth it, if and when everything else fails.

    Message was edited by: nerowolfe
    Dual G5(Leopard), MacBookPro 15, MacBookPro3,1 17 Core2Duo, Mac OS X (10.5), BC1.4 Vista Ultimate 64-bit on MBP/17"
  • Charles E. Flynn Level 4 Level 4 (1,875 points)
    Currently Being Moderated
    Nov 4, 2007 2:30 PM (in response to The Shad Guy)
    The staff at the Apple Store in Providence once told me not to attempt to restore disk images while booted from the Mac OS X DVD. It often does not work.

    I suspect that if you choose "Scan image for restore" while using Disk Utility from your hard drive, you will get the same error.

    Use the Console application to check your console and system logs. See if this is the error description:

    CoreDragCreate error: -4960

    If it is, put the entire expression into quotation marks and search for it at Google.
  • nobody loopback Level 4 Level 4 (2,570 points)
    Currently Being Moderated
    Nov 4, 2007 4:38 PM (in response to The Shad Guy)
    What are the results of typing the following in a terminal window:
    <pre>
    hdid (drag&drop your image here) -nomount -verbose -debug
    </pre>
    Dual 2GHz G5
  • nerowolfe Level 6 Level 6 (13,070 points)
    Since you have a copy of the .dmg, here's a link to convert it to an iso image.
    I have no idea what will happen, but then sometimes that works. If it fails, you lose nothing.
    http://vu1tur.eu.org/tools/
    Dual G5(Leopard), MacBookPro 15, MacBookPro3,1 17 Core2Duo, Mac OS X (10.5), BC1.4 Vista Ultimate 64-bit on MBP/17"
  • Charles E. Flynn Level 4 Level 4 (1,875 points)
    Currently Being Moderated
    Nov 4, 2007 6:12 PM (in response to nerowolfe)
    The man page for hdid, used to manipulate disk images, states “Unfortunately, read-only device images made from mounted journaled volumes will not mount because the journal can't be replayed.

    Does anyone know whether that problem has been fixed? I have always been puzzled about why the Help in Disk Utility gives no step-by-step instructions for creating a disk image of a bootable volume, and for restoring it.
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