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at a time may be installed in the Master Boot Record (MBR) of a hard drive. Search for Create and format hard disks partitions and click the top result to open Disk Management. Then select the drive where you need to reinstall the grub in place grub.To unmount a drive with Disk Management, use these steps: If you want to unmount a drive, you can also use the same Disk Management, mountvol, and DiskPart tools. If you want to make the drive mountable again, you will need to revert the changes (see above steps). Also, the system will no longer try to mount it automatically. When you unmount a drive manually, you will remove the mount point making the storage inaccessible. Somehow mount the EFI partition within Windows, drop the kernel there (with an embedded initramfs). Set the format type to Mac OS Extended (Journaled.
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Click on the Erase tab in the DU main window. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list.