diskpart select disk 0 select partition 1 active exit After restoring structure, check for file system corruption:

fdisk /dev/sda # Use 'a' to toggle active flag on the correct partition

# Mount root partition mount /dev/sda1 /mnt # Reinstall GRUB grub-install --root-directory=/mnt /dev/sda update-grub Using fdisk (Linux):

chkdsk C: /f /r

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  1. Active Partition Recovery Full ★ [ Trusted ]

    diskpart select disk 0 select partition 1 active exit After restoring structure, check for file system corruption:

    fdisk /dev/sda # Use 'a' to toggle active flag on the correct partition active partition recovery full

    # Mount root partition mount /dev/sda1 /mnt # Reinstall GRUB grub-install --root-directory=/mnt /dev/sda update-grub Using fdisk (Linux): diskpart select disk 0 select partition 1 active

    chkdsk C: /f /r