Windows INACCESSIBLE_BOOT_DEVICE (0x0000007B) — Boot Drive Not Found

INACCESSIBLE_BOOT_DEVICE BSOD occurs during startup when Windows cannot access the boot partition, often after BIOS changes, driver updates, or disk errors. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: 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. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: 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. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Enter BIOS and verify SATA mode matches what Windows was installed with (usually AHCI). Boot into Windows Recovery: Troubleshoot > Advanced > Command Prompt. Rebuild BCD: bootrec /rebuildbcd and bootrec /fixmbr and bootrec /fixboot. Enable Safe Mode from recovery: bcdedit /set {default} safeboot minimal — then remove problematic driver in Safe Mode. If SATA mode was changed, revert it in BIOS or enable AHCI driver in registry before changing. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Windows Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.