INACCESSIBLE_BOOT_DEVICE 🪟 Windows

Blue screen: INACCESSIBLE_BOOT_DEVICE (0x0000007B)

Windows lost access to the system drive during boot — storage driver/controller mode change, failed update, or disk/BCD problems.

Seen on: Windows

Meaning

Switching SATA mode between AHCI/RAID/IDE in BIOS, enabling Intel VMD/RST, cloning to a new NVMe, or an update installing a storage driver can all leave Windows without the right boot driver.

Common causes

  • BIOS storage mode changed (AHCI ↔ RAID/RST/VMD)
  • Cloned/migrated system drive
  • Bad update or pending updates
  • Disk failure or file system corruption

⚡ Quick fix

  1. Revert the BIOS storage mode
  2. From Recovery: uninstall the latest update, run chkdsk and bootrec
  3. Boot Safe Mode once to load the AHCI driver

Detailed fix by platform

Windows

  1. powershell
    # Recovery → Command Prompt
chkdsk C: /f
bcdboot C:\Windows
bcdedit /set {default} safeboot minimal   # then reboot; undo with /deletevalue safeboot

How to diagnose

  1. BIOS — Storage mode changed recently?
  2. Disk — Health in BIOS/SMART
  3. Updates — Pending at last shutdown?

🔧 Still not fixed?

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