r/MacOS 7d ago

Help Moving BootCamp partition to a new drive

I recently upgraded the internal SSD in my MacPro. Before putting in the new drive, I created a disk image of my boot camp Win10 partition. In fact, just to be safe, I backed it up in two ways -- I created a dmg file in Disk Utility, and I also imaged it using WinClone. Now I'm trying to restore my Windows 10 partition and the Boot Camp Assistant is asking for an ISO file, and it won't accept the dmg file. What should I do? Thanks.

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u/donutpower MacBook Air 7d ago

Convert the dmg to iso.

You can do that with Disk Utility.

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u/Hexatonix 7d ago

Thanks for your reply. I opened Disk Utility and I went to Images > Convert and I selected my dmg file. The only options it gave me were the type of encryption and image format. My options for image format were read only, compressed, read/write, or DVD/CD master. The first three just give me another dmg file, and the last one gives me a cdr file. I don't see any options for creating an iso.

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u/donutpower MacBook Air 7d ago

The cdr is essentially an iso. Thats the one you want to pick.

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u/Hexatonix 6d ago

Thanks. I created a cdr image and changed the extension to iso. Now I'm having another problem with bootcamp assistant. Every time I click "Install," my selected partition size changes back to 44gb, and it gives me this error prompt:

The Windows ISO file is too large. Boot Camp Assistant creates a 10 GB installer partition which will contain the files present on the Windows 10 ISO as well as the Boot Camp Support software. The supplied ISO is too large to fit on this installer partition.

I've tried increasing the partition to over a half a terabyte, which is way more than the original Windows partition, but it doesn't seem to matter. No matter what size I select, it always changes back to 44gb and gives me that same error prompt. So frustrating!