Why did this happen after Windows Update?

Windows Update sometimes replaces storage controller drivers with incompatible versions. Boot into Safe Mode and roll back the driver.

What if bootrec commands fail?

Try: diskpart > list volume to verify the boot partition exists and is healthy. Then use bcdboot C:\Windows to recreate the boot files.

Windows INACCESSIBLE_BOOT_DEVICE (0x0000007B) — Boot Drive Not Found

Criticalbsod

Overview

INACCESSIBLE_BOOT_DEVICE BSOD occurs during startup when Windows cannot access the boot partition, often after BIOS changes, driver updates, or disk errors.

Key Details

Stop code 0x0000007B — Windows cannot access the system partition during boot
Very common after changing SATA mode in BIOS (IDE to AHCI or vice versa)
Can occur after Windows Update installs a new storage controller driver
Also triggered when moving a Windows drive to a different computer
The BCD (Boot Configuration Data) may be pointing to the wrong partition

Common Causes

SATA mode changed in BIOS from AHCI to IDE or RAID
Storage controller driver missing or incompatible after update
Boot configuration data (BCD) corrupted or pointing to wrong partition
Windows drive moved to a new computer with different storage controller
Corrupted or missing storage driver files on the boot partition

Steps

1Enter BIOS and verify SATA mode matches what Windows was installed with (usually AHCI)
2Boot into Windows Recovery: Troubleshoot > Advanced > Command Prompt
3Rebuild BCD: bootrec /rebuildbcd and bootrec /fixmbr and bootrec /fixboot
4Enable Safe Mode from recovery: bcdedit /set {default} safeboot minimal — then remove problematic driver in Safe Mode
5If SATA mode was changed, revert it in BIOS or enable AHCI driver in registry before changing