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Of course don't reformat the Windows 7 hard drive until you are sure you are booting with the single Windows 10 hard drive. Move your BCD to the first partition on the Windows 10 disk - the one marked D: drive 29.29GB in your disk management screenshot.
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Then under the BCD Backup/Repair menu, select change boot drive. Click Repair your computer Windows Vista System Recovery Options. Select the language and keyboard method and click Next Windows Vista Repair Your Computer Menu. Set partition as active on Windows Vista Insert the installation DVD and boot from it (press any key at the 'Press any key' screen). Here is the way to fix, repair, rebuild or restore MBR in Windows 10. If MBR (Master Boot Record) is corrupted or inaccessible, your Windows 10 won't boot.
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Windows Vista if you already have Windows XP installed or Ubuntu (Linux) next to your already.
#Windows create boot partition install
Whenever you install another operating system, e.g. A boot partition is also known as a boot volume. A Windows boot partition is the partition that holds the necessary files for the Windows operating system (either XP, Vista, 7, 8, 8.1 or 10). Now click on Disk Management under Storage. You can also click Classic View and then choose Administrative Tools. Set Active Partition via Disk Management Open Computer Management by going to the Control Panel, clicking on System and Maintenance, and then clicking Administrative Tools.