Mac partition cannot unmount disk6/18/2023 In my case, I used MiniTools Partition Manager to migrate my Windows installation from my HDD to the new SSD drive. The root problem probably has much to do with the partitions structure. The problem is that it for some reasons tries to unmount the partition it has booted from, which is obviously not possible hence, it fails. First, it copies the installation files to the HDD partition (that part creates problem), and then it reboots from that partition to install the files and eventually create the Recovery partition. If the USB is in fact created with that tool, the installer divides the installation process into two. The problem I believe was due to the createinstallmedia tool. Then, I thought it was the fact that I was using the installer in El Capitan to install it to the new partition. At the first, I thought the volume was dirty, so I booted to my working El Capitan again and had formatted the partition again. It always ended up with a NASTY error message saying that it could not unmount the volume for repair (what repair, anyway?). Recently, I have been having weird issues installing Sierra to my newly created partition.
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