Making a bootable OSX USB from dmg on Linux
Solution 1
Have you tried "Acetoneiso"?
It'll convert the DMG to an ISO for you. After that, the easiest way I know of to make a bootable USB is using DD.
dd if=/path/to/osx.iso of=/dev/sdX && sync
Note: sdX is an example, you will have to check your flash drive address (usually sdb if you have only one hard disk). Do not add a partition # after that (such as sdb1). This method is a little hard on flash drives (I have killed one or two doing this relatively frequently, but once should be fine).
If you are unfamiliar, DD is a bit by bit copy and sync just verifies that all files have been written to the usb.
Solution 2
Install dmg2img
sudo apt-get install dmg2img
Convert DMG image file to ISO file
dmg2img -v -i /path/to/image_file.dmg -o /path/to/image_file.iso
Copy ISO image to USB
sudo dd if=/path/to/image_file.iso of=/dev/sdb && sync
sdb is an example. In your case it might be different
Edit
You can do the conversion and actual writing in one pass, if you don't need the .iso afterwards: it will take half the time as converting to .iso and THEN writing to the USB device. Just do:
sudo dmg2img -v -i /path/to/image_file.dmg -o /dev/sdb
Again, sdb is an example. In your case it might be different.
Solution 3
Try booting from Internet Recovery (Command + Alt + Shift + R) and opening the installer app from Terminal.
Open Terminal in recovery and:
cd /Volumes/NAME-OF-YOUR-USB-STICK/
cd The-Name-Of-Your-Installer.app/Contents/MacOS
./InstallAssistant
The installer should load.
Solution 4
If you can find another Mac, try the Disk Utility App.
You can "Restore" your 10.8 DMG to your USB drive. This will make your USB drive be bootable.
Related videos on Youtube
![Admin](/assets/logo_square_200-5d0d61d6853298bd2a4fe063103715b4daf2819fc21225efa21dfb93e61952ea.png)
Admin
Updated on September 18, 2022Comments
-
Admin almost 2 years
I have 2 machines - a MacBook Pro and a desktop running Fedora, I have a USB drive and a OSX 10.8 dmg. The MacBook won't boot into OSX unfortunately, I'm trying to make a bootable mac usb to recover it.
Any insight? I've tried
dmg2img
but no success putting that image onto the usb drive.Is there an easy way to do this?
-
nerdwaller over 10 years@Francesco - Do some research on the format differences between a
dmg
(non-standard) andiso
(standard) -
Francesco over 10 yearsAccordign to this guide: macbreaker.com/2014/01/… this should work on Mac Osx:
sudo dd if="location of Niresh disk image" of=/dev/r"identifier" bs=1m
So why should not on linux ? -
nerdwaller over 10 years@Francesco - Never said it doesn't. Please ask your own questions rather than piggy backing off other's and providing unrelated/chatty comments. You can also see if anyone is available in chat.
-
Francesco over 10 yearsI just want to add detail to the answer ... why you should to convert the image if it is not required ?
-
nerdwaller over 10 years@Francesco - Again, look at the differences between
dmg
andiso
.iso
is a standard,dmg
is often contains compressed items, whereiso
s do not. To avoid the few rare cases in which admg
behaves as aniso
, it's best to just convert it to a known valid format. If you write the commondmgs
(that contain compression) to a USB, many things do not handle them correctly. So you aren't adding details, you're asking questions without researching it beyond a single case in which your point is true while ignoring the numerous cases in which it is false. -
Luigi Ranghetti over 8 yearsYou can as well just use
hdiutil convert EXAMPLE.dmg -format RdWr -o EXAMPLE.img
, according to this answer. -
IFightCode about 8 yearsHow USB should be formatted? Partitionmap GUID/MBR? Formatting FAT/NTFS/HFS+?
-
IFightCode about 8 yearsHow USB should be formatted? Partitionmap GUID/MBR? Formatting FAT/NTFS/HFS+?
-
IslwynD almost 8 years@Enthusiast these instructions are writing a raw disk image to the device. Its formatting and data before the operation will be overwritten and therefore don't matter.
-
bparker almost 8 yearsThis does not create an ISO image, it is an HFS+ image like all the other tutorials that use this program. I still have not found a workable solution.
-
Anwar almost 5 years+1 for the direct burning to usb method
-
FlexMcMurphy about 3 yearsI use this method to extract a disk image of a hfs+ partition from a file called BaseSystem.dmg which is part of a recovery image for macOS. I can then mount that .iso file using
sudo mount -t hfsplus -o loop BaseSystem.iso /mnt/macimage/
However if I then write that .iso file to a usb drive using dd as you describe above then that hfs+ partition in that usb drive will NOT mount. Instead I get error:Wrong fs type, bad option, bad superblock on /dev/sdc2, missing codepage or helper program or other error
Why will it not mount when on the USB drive? Doesdd
mess up hfs+ disk images?