Hello all,
I went to open an old .dmg that I have today and got an error message that reads, "The disk image couldn't be opened. The disk image format is obsolete. Please convert it to a new format using the command line tool 'hdiutil'
So, wondering if anyone knows the command line code to change to a new formate and how I would do that?
Thank you!
MacBook Pro 13″, macOS 12.4
hdiutil convert imageFile -format UDRW -o ~/Desktop/newImageName
imageFile needs to be the full path to the image to convert. If there are spaces in the path, enclose the full path/name in ""
newImageName could be just about anything you want. It should automatically add the extension.
It will create a read/write disk image. It should not do anything to the original image.
If you use UDRO instead of UDRW, it will be a read only disk image.
If you are confused on entering the full path to the original image, just copy up to convert and paste into Terminal, leave a space, then drag the image file into the Terminal window. It will fill out the path. paste in the part after imageFile.
I don't have any idea if it can actually convert an obsolete image as I don't have one to try.
I think you will also have to add Terminal to Full Disk Access in the Security & Privacy System Prefs, Privacy tab.
hdiutil convert imageFile -format UDRW -o ~/Desktop/newImageName
imageFile needs to be the full path to the image to convert. If there are spaces in the path, enclose the full path/name in ""
newImageName could be just about anything you want. It should automatically add the extension.
It will create a read/write disk image. It should not do anything to the original image.
If you use UDRO instead of UDRW, it will be a read only disk image.
If you are confused on entering the full path to the original image, just copy up to convert and paste into Terminal, leave a space, then drag the image file into the Terminal window. It will fill out the path. paste in the part after imageFile.
I don't have any idea if it can actually convert an obsolete image as I don't have one to try.
I think you will also have to add Terminal to Full Disk Access in the Security & Privacy System Prefs, Privacy tab.
Happened to me too. On upgrading from Big Sur to Monterey. The solution should be simpler than above. Open Disk Utility, go to Images>Convert. Disk Utility will allow you to create a new disk image from the old one, which will open ok. You will have to choose which characteristics you want, and set up the password again.
I thought it was weird of Apple to send a cryptic message telling the user to go plunge into Terminal for something like this.
Thank you!!
Disk image format obsolete
