Changing Harddrive Bay on a Mac Pro 5.1

Hey there!

Here is the situation right now: Inside my Mac Pro I have 4 Harddrives installed:

Bay 1: APFS SSD with MacOS Mojave (My main system)
Bay 2: APFS HDD Storage Harddrive
Bay 3: NTFS HDD Storage Harddrive
Bay 4: NTFS HDD with Windows 10 (legacy boot)

My plan is to get rid of all the HDDs (= put them into an external case) and move the windows system to a SSD in bay 2.

Now, I haven’t bought the SSD yet, but I do see the following problem:
When I take out all the HDDs and put the Windows system into Bay 2, Windows is unable to boot. I just see a black screen with a blinking underscore. The same happens when I leave it in Bay 4 and just pull out one or two of the other HDDs. My guess is that legacy boot always expects Windows to be on the 4th installed harddrive.

So I tried to make it bootable with Winclone (had to disable Hibernate so read/write would work), but I get an error message saying “Change Bootable error - Winclone could not find disk uuid and partition uuid”.

My Question is… Is there any way to move Windows to another Bay (and potentially to SSD) without reinstalling Windows?

Kind regards


I had not heard that moving between bays caused Windows to become unbootable. This makes it seem related to drive letters: