Warning failed while updating the boot sectors for disk1 partition1
But if you found this out on your own, I’ll be quite interested to know what other experiments you’re up to. But the explanation is brilliant, and very well done, by no means am I suggesting that you lifted the entire thing off anywhere : I have been searching, and this is the first newbie friendly explanation of the procedure.
Of course you can : try some of the steps in execute the commands given in the file manually at the command prompt of Windows setup, Windows PE, or another windows installation.
But this mode can be used to install only 64-bit Windows versions, and the whole procedure is quite complicated as already mentioned.
Then, it is easier to install Windows to an MBR disk in the normal mode and after that convert it into GPT using gptgen. In Windows 10 1703 (and above) there is a console utility mbr2gpt.exe, which allows you to convert the disk partition table from MBR to GPT without losing data (see the article Convert MBR to GPT without losing data in Windows 10)To convert a hard disk from MBR into GPT online, you can use a small tool Gptgen that allows to change the partition table format on the fly without having to delete all partitions of the disk (without data loss). Before conversion, we strongly recommend to copy all critical data to the different external drive.
The Windows operating system can not boot from GPT disks on old BIOS systems.
To work around this limitation, we will move the Windows bootloader (BCD) to a separate small USB flash drive (or HDD drive) with the MBR partition table.
Restart the computer and make sure that the BIOS can not boot from the hard disk with the GPT table. You can make sure your Windows is located on the GPT drive.
Open Disk Manager (diskmgmt.msc) and select system disk properties.
However, only 64-bit Windows versions installed on motherboards supporting the new UEFI specification (Unified Extensible Firmware Interface) are able to boot from a GPT volume.
If you want more detailed instructions, drop a comment, and I’ll try to find a detailed tutorial. Then just follow the rest of the instructions on this blog. And thank you for your great and fast support I just tried to do a clean Win 10 install on an older machine (BIOS but supposedly UEFI capable) with the same USB I used to install my newer (UEFI) machine but the USB won’t boot at all.
Yeah, so in Linux, create 2 new partitions formatted as NTFS, one small (~100MB) and one for holding Windows itself. So now i have setup 2 ntfs partitions and am in the recovery. I guess this is the method I will need to use (Although planning to use a secondary hd instead of a flash drive for the boot loader).
The Windows Disk Management snap-in allows you to convert an MBR disk into a GPT if it is unallocated or «clean». Though I have never seen a failure of the gptgen tool that results in the total crash of the file system, I do recommend all users to save important data before partition table conversion.
Thus, the conversion of partition table into GPT has been successful! Boot from the Windows installation (DVD/USB) media with (suitable Windows 10 or Windows 7 installation image), and press Shift F10 on the Windows Setup screen to open the command prompt: Go to BIOS and change the boot order so that your USB flash drive or SD card come first. If you have done it right, the system should boot correctly.