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So you downloaded an .iso image, and now you want to convert it to .dmg format? How can I convert .dmg to a Windows-compatible .iso on Mac? Don’t bother downloading any third party software, you can easily convert .dmg to .iso or .iso to .dmg format using the Terminal or Disk Utility on Mac OS X.

The DMG file extension was specifically designed for Macintosh computers and users are likely to have a lot of trouble if trying to use them on a Windows device. There may be instances where one can convert the files, but it probably needed to look for additional utilities that will allow the file to be accessed from the chosen device. One button to convert DD image to DMG image and vice versa. Once you click on the Convert DD DMG button, a choose file window will pop up allowing you to select either dd image or dmg image. Click on Open will proceed to convert the image to the other format. Selecting a dmg image to convert to dd. First, mount the.dmg file as a block device only: hdid -nomount '/Volumes/Diotallevi/Clean Checkpoints/WDC Image.dmg' Second, determine the block device of the image and destination: diskutil list Third, use dd with an appropriate buffer size to copy over the whole block image, including partition table and boot sector. Note that it is. A lot of modern disk image handling utilities like AnyToISO can convert Apple DMG images to CloneCD IMG format, which is essentially what dmg to img conversion is. Nowadays you would be better of with standard ISO, but some software might still require specific disk image format.

Method 1: Convert Between .DMG and .ISO Using Terminal

Mac OS X has a command line tool called hdiutil which allows you to create, mount and convert different types of disk image with ease. Here’s how to convert .dmg to .iso format using the Terminal:

1. Just press Ctrl + Alt + T on your keyboard to open the Terminal.
2. Enter the following command into the Terminal window, assuming that you’ve put the .dmg file on your desktop.
   hdiutil makehybrid -iso -joliet -o ~/Desktop/filename.iso ~/Desktop/filename.dmg

   When the process finishes, you’ll get an ISO image that is compatible with Windows, Linux, Ubuntu and Mac.

If you need to convert a disk image from .iso to .dmg, just execute the following command in the Terminal window:
hdiutil convert ~/Desktop/filename.iso -format UDRW -o ~/Desktop/filename.dmg

Sit back and wait for the process to complete.

Method 2: Convert Between .DMG and .ISO Using Disk Utility

1. Just launch Disk Utility (in /Applications/Utilities). In the menu bar at the top of the screen, select Images -> Convert.
2. Browse to the .DMG or ISO file you would like to convert, select it and click on the Choose button.
3. In the pop-up window, select Desktop as your destination. In order to convert .dmg to .iso, make sure to choose DVD/CD master as the Image Format. Click on Convert.

   If you want to convert .iso to .dmg, set the Image Format to “compressed” instead. Click on Convert and you’ll have a .dmg file ready to use.

4. Simply rename the converted .cdr file to .ISO and you’ll get a Mac-compatible .ISO image. However, a renamed file won’t work on Windows or Linux. To make a Windows/Linux/Mac compatible .ISO file, you have to convert the .cdr file to .iso format using this command:
   hdiutil makehybrid -iso -joliet -o ~/Desktop/filename.iso ~/Desktop/filename.cdr

Conclusion

DMG is a disk image format commonly used by Mac OS X, but it’s practically unusable on Windows or Linux platform. After converting .dmg to .iso on your MacOS, you can copy it to any Windows or Linux computer for burning or mounting.

Wow, great hint. This is going to go to good use. Thanks!

Convert Dd Image To Dmg Free

Somehow I thought that was what the menu item Images -> Scan Image for Restore always did... but I suppose there has been at least one occasion where this may have actually been what I needed.
g=

Happily, I've never found myself in a position where I needed to restore my backup image files, (made with Carbon Copy Cloner.) But I'd like to know the routine if I ever need to use it.
My question: since I back up separate partitions into separate disk image files, is this hint inapplicable to me? Does this hint only apply to backing up multiple partitions into a single disk image?
(I had no idea it was even possible to backup multiple partitions to a single disk image...)

This is great. I was getting real frustrated with Disk Utility's non-specific error messages. This worked just like you said it would.

Great post. However, when I tried this I got a 'Resource busy' error.
In order to avoid this problem, you have to make sure the mac OS isn't 'using' the device first. To do this just open the DiskUtility.app, and on the target USB hard drive, unmount any of it's partitions. Make sure to not eject the USB hard drive so that the device is still available in DiskUtility and shows up in the result from 'diskutil list'.

Convert Dd Image To Dmg Image

Convert Dd Image To Dmg Online

Many thanks to you and daveosborne for your hints !
1) I'm currently dumping the content of a .dmg file to an external disk.
2) 'with an appropriate buffer size to copy over the whole block image, including partition table and boot sector'
-> what do you mean by that and how can I determine which buffer size is appropriate ?
-> how did you determine the 131072 size ?
For my use I trusted blindly the example and used the bs=131072 option. Untill now it seems to be working... (it's still copying).
I'm currenlty getting tons of lines on my terminal screen that look like :
...
CZlibDecompressor::decompressData: src 0x02E4AA97 srcLen 116073
CZlibDecompressor::decompressData: dest 0x02E26000 destLen 262144
CZlibDecompressor::decompressData: src 0x02E61F0D srcLen 20723
CZlibDecompressor::decompressData: dest 0x02E26000 destLen 262144
...
with sometimes long series of
...
CZlibDecompressor::decompressData: src 0x02E66B71 srcLen 1167
CZlibDecompressor::decompressData: dest 0x02E26000 destLen 262144
CZlibDecompressor::decompressData: src 0x02E66B71 srcLen 1167
CZlibDecompressor::decompressData: dest 0x02E26000 destLen 262144
...
I notice the destLen (I suppose it means block destination length) 262144 is exactly the double of the bs=131072 that was used before. I'm curious if anyone can help me understand this. Does this mean the source data is sparsed over the destination disk by blocks of 131072 or 262144 bytes, thereby fragmenting the disk ?
In your replies, please kindly take into account that I'm a French newbie with a fair level of ignorance of OSX command line technical slang, however not completely ignorant with computers either (one piece of paper even says I'm an engineer :), it's just that I don't understand what the buffer size technically means here.
Many thanks in advance for your insights !