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In this howto there are the steps to follow when a Windows 10 OS is not bootable anymore and you haven’t a recovery disk. This is a typical case after a new OS will be installed on Dual boot or boot partition was altered.
Download Windows 10 iso: Download the official Windows 10 image Prepare USB to be bootable: Open GParted with
gparted /dev/DEVICE-TO-ERASE
Select the USB drive
Device \> New partition table
Select GPT
Apply: this will delete any data on the USB
Create a new NTFS partition then Apply (do not use FAT32 since some files can be greater than 4GB)
Close GParted
Write files:
Unplug and plug USB
Copy all Windows files to the empty USB drive using 7zip with:
7z x -y -o/media/user/path-to-USB/ Win10_1809Oct_Italian_xiso
If something goes wrong during copy, you can mount the ISO image then rsync the source with the USB drive (the trailing slash is important):
cd path/to/usb/drive rsync -avzp /media/myuser/CCCOMA_X64FRE_IT-IT_DV91/ .
umount
Add boot flag
Open GParted selecting the device just written Select the new partition then Select Partition \> Manage flags Select boot flag (esp will be auto-selected)
Use windows tools Follow this howto by MS to recover MBR, restore BCD or similar actions
You can follow these steps to write on a USB a recovery ISO from windows the same way.
https://web.archive.org/web/20190326000000*/https://en.wikipedia.org/wiki/GParted