Restoring bootcamp from DMG

Discussion in 'Windows, Linux & Others on the Mac' started by unixperience, Aug 20, 2010.

  1. unixperience macrumors regular

    Jul 21, 2010
    I was looking online at various ways to backup my bootcamp partition and I found that you can use Disk Utility to make a .DMG of my bootcamp partition. Sounded good, now all I need is time machine to back up both my windows and os x.
    upon further reading I found few people knew how to properly restore the .DMG so I came across this
    Does anyone know if this actually works?

    If it does it would be a great way to backup windows using Time Machine, a few extra steps, but no need for extra 3rd party programs.
  2. balamw Moderator


    Staff Member

    Aug 16, 2005
    New England
    Winclone is basically a front end to ntfsprogs and some of the other OS X routines behind Disk Utility.

    This approach is similar to what Winclone does to restore XP to a bootable state.

    It probably won't work for Vista/7 as their boot process is a bit more involved. (BCD vs. BOOT.INI.)

  3. unixperience thread starter macrumors regular

    Jul 21, 2010
    I just used this for Win7 64 bit (in fact I'm typing this on my win7 partition) and everything works fine. I'm pleased with the results.
    This might not be the best option for those with smaller hdd. I have a 500gb (300GB osX/200GB windows) and my 70GB windows compressed to a 38GB dmg file. Which time machine will easily back up along with my other mac files.
    The problem with winclone, is last I heard it doesn't support win7 well, and I even heard a few compatibility issues with snow leopard. I also figured I would then have to partition my backupdrive. Which would probably be fine but this way if it's hidden in my osx, I only need one partition formatted for mac.
    Moreover my external is only big enough to store my osX anyway. When I get a new external I may go another route but if anyone wanted to find a way to "trick" Time machine into backing up windows, here it is.
  4. unixperience thread starter macrumors regular

    Jul 21, 2010
    Here are the instructions from the following link

    "After analyzing and trying things out, I was able to solve this. It seems that Boot Camp does not flag the partition as ACTIVE immedately after Boot Camp creates the new partition from windows.

    Assuming you already have a .dmg image of your previous Windows Boot Camp partition, do the following:

    :: 1
    Use Boot Camp to allocate the new space. Don't use Disk Utility because the MBR will not be configured properly

    :: 2
    Use Disk Utility to restore your .dmg image to the new Boot Camp partition you just created. Be sure to run IMAGES --> SCAN IMAGE FOR RESTORE in Disk Utility before restoring. You may need to unmount the Boot Camp partition in Disk Utility before it begins to restore.

    :: 3
    Use fdisk in Terminal to mark the Boot Camp partition active. First, enter the fdisk MBR edit mode by running the following:

    $sudo fdisk -e /dev/disk0

    Ignore the error "could not open MBR file /usr/standalone/i386/boot0: No such file or directory". Then, determine which partition number to mark active by running the following (*in bold*):

    fdisk: 1> show

    Your windows partition should be #3 labeled "Win95 FAT-32". Now, mark the partition active:

    fdisk: 1> flag 3
    Partition 3 marked active.
    fdisk:*1> write
    Device could not be accessed exclusively.
    A reboot will be needed for changes to take effect. OK? [n] y
    Writing MBR at offset 0.
    fdisk: 1> exit

    Now, reboot and hold the OPTION key and Windows should be listed as a bootable option."
  5. balamw Moderator


    Staff Member

    Aug 16, 2005
    New England
    It works fine if you use uncompressed dmg as the target format as suggested here.

    Which is exactly why I say it is pretty much the same thing Winclone is doing.

    I wonder if it helps that you are restoring to a partition of the same size... Winclone supports resizing partitions.

  6. unixperience thread starter macrumors regular

    Jul 21, 2010
    You could be right about the partition size thing. I did restore to the same exact size. I would guess it would work if you made a larger partition, but probably not a smaller one. I'm not really willing to try it out :pI'm pleased with the performance I'm getting now

    As I side note I did use a COMPRESSED image, and it still worked fine
    Thanks for your input balamw
  7. thermodynamic Suspended


    May 3, 2009
    Thanks for the post - unfortunately the Apple site link goes to a 'not found' page (it may have been archived or deleted), but as I am working on making a viable backup procedure for my Win7 partition, I wanted to acknowledge your post and hopefully have more to say in the future. :)
  8. tep macrumors newbie

    Aug 12, 2013
    scripting fdisk

    Is there a way to script fdisk to automate this process?
  9. MJL macrumors 6502a

    Jun 25, 2011
    Zero problems with Winclone 3 and Windows 7 and zero problems with Winclone 4 and Windows 7 & 8. Winclone 4 will backup and restore a partition that has been changed to AHCI.

    No affiliation, just a very, very happy user, cannot praise it enough.
  10. Brein macrumors newbie

    Oct 24, 2013
    This sounds nice.. but it's not true

    Trying this has wasted hours of my life. I've found Winclone AND Paragon Camptune completely useless. It's been a few years since I tried but I just dug up the emails asking for a refund. (Which I got, fair enough.) I'll quote from them:

    "I found Winclone because it gets mentioned in almost any online discussion about Bootcamp. But Winclone doesn't do Fat32, apparently. Didn't spot that, but even so I would have interpreted it as: 'it EVEN does NTFS', as OSX reads Fat32 natively.

    After I manually reinstalled my bootcamp (ntfs this time), I thought I might use Winclone to at least make a backup of my new system.
    It refused to make a backup on any kind of disc I attached to my Mac, quoting errors I've forgotten by now. I did the usual (disk check, repair permissions)but it refused to write any kind of file. Which it only tells you after you've gone through all the dialogues.

    By the way, I also bought Paragons Camptune, which also failed to work, so I was getting rather upset at having purchased all kinds of software that turned out not to work. There is nothing wrong with or weird about my system. The only thing I can think of is that I upgraded from Snow Leopard to Lion, so maybe the hidden recovery partition causes a problem."

    So this is a reminder to myself if I ever decide to try again and a warning for others: THIS DOES NOT WORK. Rebuild, save yourself money and (ultimately) time. And ignore the people who posted above me, who by now must be cleaning out casino's and dating supermodels too, with their luck.
  11. (worldcitizen) macrumors newbie

    Oct 26, 2013
    Here is a working link (link didn't work because it was abbreviated with "..."):

Share This Page