| Scenario | BootICE Solution | |----------|------------------| | "NTLDR is missing" (old XP systems) | Rewrite the PBR of the system partition to NTLDR type. | | "Bootmgr is corrupted" (Windows 10/11) | Reinstall Windows NT 6.x PBR and rebuild BCD from scratch. | | Dual-boot Linux/Windows after Windows update wiped GRUB | Install GRUB4DOS to MBR and chainload GRUB from Linux partition. | | Booting from a USB flash drive as HDD | Change MBR type to Windows NT 6.x and PBR to NTFS. | | Corrupted BCD preventing any boot | Use BootICE's BCD editor to create a new BCD store from an offline Windows installation. |
BOOTICE (BOOTsect Image Creator and Editor) is a free, open-source utility software that allows users to edit and manage the boot sector of a hard drive or other storage device. It is a powerful tool that provides a graphical interface to work with the Master Boot Record (MBR), boot sectors, and other low-level disk structures. bootice
BOOTICE offers more flexibility than the Windows Disk Management console: | | Booting from a USB flash drive