Create a choose an 'EFI system' partition – a FAT32 partition that'll hold the Windows BOOTMGR and the BCD.Make sure the chosen 'system' partition is set as "active". The currently present "System Reserved" partition will do, I think? It doesn't need to be the first partition, but it must be within the first 2TiB of the disk. It must be a primary partition, and Microsoft also wants it to be separate from the main Windows partition (C:) – official docs. (It is even possible to install Windows with only 'dism' and 'bcdboot'.)Ĭreate or choose the 'system' partition – an NTFS partition that'll hold the Windows BOOTMGR and the BCD. Is this simply a matter of disconnecting Disk 1 then booting and maybe doing a startup repair to let Windows automatically create a new MBR or should I use some software like EasyBCD or are the command line utilities like bcdboot and bcdedit enough? If the latter, what would be the exact commands I would need to get the job done? So now I need to safely get the MBR and bootmgr from Disk 1 to Disk 0. Now I am comfortable with my new OS setup and want to format Disk 1 to a single partition so that I can copy the data from Disk 2 to Disk 1 to use the newer faster drive as my backup and just keep Disk 2 as a redundant backup stored offsite. Here is an image of my Disk Manager:ĭisk 2 (D:) is an old slow dying backup HDD.ĭisk 1 (G:) is a much newer faster (7200rpm) HDD which used to have the OS on it.ĭisk 0 (C:) is a very new SSD which now has the OS on it.ĭisk 1 has all of the boot info on it because I wanted to be able to still get into the old OS while I was getting the new OS set up and tweaked. I have several hard drives in my desktop but only 1 has the OS (Win 10).
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