# How to Fix INACCESSIBLE_BOOT_DEVICE in Windows 11

URL: https://www.mytechnician.tech/tips/fix-inaccessible-boot-device-windows-11/
Published: 2026-05-20 | Updated: 2026-08-10 | Author: Ankit Kumar
Tags: Windows 11, BSOD, Boot, Fix
Summary: INACCESSIBLE_BOOT_DEVICE on Windows 11 after an update or BIOS change? Uninstall the bad update in WinRE, fix the storage mode, and rebuild boot files.
Recommended app: RecoverPro — https://www.mytechnician.tech/apps/data-recovery-pro/ (Microsoft Store: https://apps.microsoft.com/detail/9MZ613NS5TNN?hl=en-us&cid=mytechnician-web). Optional; every step below uses built-in Windows tools.

## The Problem
**INACCESSIBLE_BOOT_DEVICE** (stop code `0x0000007B`) means Windows loaded far enough to look for its system drive and could not reach it. The drive is usually fine and your data is usually intact—what broke is the path to it: the storage driver, the boot configuration, or a firmware setting.

It typically appears after a Windows update, a BIOS or firmware change, a cloned drive, or moving a disk to different hardware.

> Stuck in a repair loop rather than a clean blue screen? See [fix the Automatic Repair loop](https://www.mytechnician.tech/tips/fix-automatic-repair-loop-windows-11/). For BSOD basics: [fix the Blue Screen of Death](https://www.mytechnician.tech/tips/how-to-fix-bsod-blue-screen/).

## Before You Start
Have your **BitLocker recovery key** to hand—get it from `account.microsoft.com/devices/recoverykey` on your phone. Several of the steps below trigger a recovery prompt on an encrypted drive.

## Step 1: Check the Storage Mode in Firmware
This is the fastest fix and the most common cause after any firmware change or CMOS reset.

1. Restart and enter BIOS/UEFI—tap **Del**, **F2**, or **F10** at power-on. See [how to enter BIOS or UEFI settings](https://www.mytechnician.tech/tips/how-to-enter-bios-uefi-windows-11/).
2. Find **SATA Mode**, **SATA Operation**, or **Storage Configuration**.
3. It must match what Windows was installed with—normally **AHCI**. Dell laptops frequently ship as **RAID On**, and switching them to AHCI (or back) causes exactly this stop code.
4. Save and exit.

If you do not know which mode Windows expects, try the other setting once. If that does not help, switch it back and continue below.

**If you must switch modes permanently** (RAID → AHCI), boot into Safe Mode first so Windows loads the generic driver, then change the firmware setting, then boot normally.

## Step 2: Check the Drive Is Detected At All
While you are in firmware, confirm the SSD or hard drive appears in the boot device list. If it does not:

* Power off, unplug, and reseat the M.2 stick or the SATA data and power cables.
* Try a different SATA port or M.2 slot.
* A drive that is invisible to firmware is a hardware problem, not a Windows one.

## Step 3: Open the Recovery Environment
Force-shutdown at the logo three times. On the next boot Windows opens **Automatic Repair** → **Advanced options** → **Troubleshoot** → **Advanced options**.

## Step 4: Uninstall the Latest Update
The number-one fix when the blue screen started right after Patch Tuesday.

1. **Advanced options** → **Uninstall Updates**.
2. Choose **Uninstall latest quality update**.
3. If that does not apply or fails, try **Uninstall latest feature update**.
4. Restart.

## Step 5: Run Startup Repair
**Advanced options** → **Startup Repair**. One attempt; if it fails twice it will not succeed on a third.

## Step 6: Repair From the Command Prompt
Open **Advanced options** → **Command Prompt**. First identify the drive letter—it is often not C: in the recovery environment:

```cmd
diskpart
```
```cmd
list volume
```

Note the letter of the large NTFS volume, then `exit`. Substitute it below wherever you see `C:`.

```cmd
chkdsk C: /f /r
```
```cmd
sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows
```
```cmd
bootrec /rebuildbcd
```

If the boot configuration is beyond repair, rebuild it outright:

```cmd
bcdboot C:\Windows /s C: /f UEFI
```

## Step 7: Remove a Bad Storage Driver Offline
If a storage or RAID driver update caused this, you can remove it without booting Windows. From the recovery Command Prompt:

```cmd
dism /image:C:\ /get-drivers /format:table
```

Find the third-party storage driver in the list (published name `oem##.inf`), then remove it:

```cmd
dism /image:C:\ /remove-driver /driver:oem12.inf
```

Windows falls back to its built-in driver on the next boot. Replace `oem12.inf` with the actual entry from the table.

## Step 8: Roll Back From Safe Mode
If Windows will boot into Safe Mode, that is easier: **Advanced options** → **Startup Settings** → **Restart** → press **4**. Then **Device Manager** → **IDE ATA/ATAPI controllers** or **Storage controllers** → **Properties** → **Driver** → **Roll Back Driver**. See [how to enter Safe Mode](https://www.mytechnician.tech/tips/how-to-enter-safe-mode-windows-11/).

## What Not to Do
* **Don't initialize or format the disk** from another PC to "make it readable". Windows offering to initialize a drive it cannot mount is the fastest way to destroy the partition table and your data.
* **Don't clean-install over the top before recovering files.** The partition is almost always readable from another machine or a live USB.
* **Don't change SATA mode back and forth repeatedly** while BitLocker is active—each change costs another recovery-key entry.

## Still Will Not Boot?
* Drive absent from BIOS entirely → reseat it, then test its health on another machine: [check SSD or hard drive health](https://www.mytechnician.tech/tips/check-ssd-hard-drive-health-windows-11/).
* Everything else exhausted → recover your files first, then reinstall: [reinstall Windows without losing data](https://www.mytechnician.tech/tips/reinstall-windows-without-losing-data/).

> **Drive readable but Windows will not load?** [RecoverPro](https://www.mytechnician.tech/apps/data-recovery-pro/) can pull your files off the partition before you attempt any reinstall.

---
Source: https://www.mytechnician.tech/tips/fix-inaccessible-boot-device-windows-11/ — My Technician, free Windows 10/11 troubleshooting guides.
Related tool: RecoverPro (Windows data recovery software to recover deleted files, restore formatted drives, and rescue data from corrupted partitions on Windows 10 and 11.) — https://www.mytechnician.tech/apps/data-recovery-pro/
More guides: https://www.mytechnician.tech/llms.txt