INACCESSIBLE_BOOT_DEVICE Error in Windows — Causes & Fix

The INACCESSIBLE_BOOT_DEVICE error is a common Blue Screen of Death (BSOD) issue in Microsoft Windows. It usually appears when Windows cannot access the system partition during startup.

This error often occurs in:

• Windows 10
• Windows 11
• After Windows updates
• After changing SATA/BIOS settings
• fter cloning or replacing a hard drive

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What Does INACCESSIBLE_BOOT_DEVICE Mean?

This error means Windows lost access to the drive containing the operating system files. When that happens, the system cannot boot and crashes with a blue screen.

Common Causes

1. Corrupted or missing boot drivers
2. Incorrect SATA mode (AHCI/IDE/RAID) in BIOS
3. Damaged system files
4. Failing hard drive or SSD
5. Bad Windows update
6. Incorrect disk cloning

How to Fix INACCESSIBLE_BOOT_DEVICE (Step-by-Step)

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1. Restart Your PC

Sometimes the issue is temporary. Restart your system first.

2. Enter Safe Mode

1. Force shut down your PC 3 times during boot
2. Windows will open Automatic Repair
3. Go to:

• Advanced Options
• Startup Settings
• Restart

1. Press 4 to enter Safe Mode

If Windows boots in Safe Mode, uninstall recent updates or drivers.

3. Check BIOS SATA Mode

1. Restart and enter BIOS (F2, DEL, or F12 depending on manufacturer)
2. Find SATA Mode settings
3. Switch between:

• AHCI
• IDE
• RAID

Save changes and restart.

f you recently changed this setting, switch it back.

4. Run CHKDSK Command

Open Command Prompt from Advanced Options and type:

This scans and repairs disk errors.

5. Repair System Files (SFC & DISM)

From Command Prompt:

If that doesn’t work:

6. Uninstall Recent Windows Update

If the error appeared after an update:

1. Go to Advanced Options
2. Click Uninstall Updates
3. Remove the latest quality update

7. Rebuild Boot Configuration (Advanced)

Run these commands in Command Prompt:

Hardware Check

If none of the above works:

• Check SATA cable connections
• Test SSD/HDD health
• Replace failing drive
• Check RAM

How to Prevent This Error

✔ Avoid sudden shutdowns ✔ Keep drivers updated ✔ Don’t change BIOS settings unnecessarily ✔ Create system restore points ✔ Use reliable disk cloning tools

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Final Thoughts

The INACCESSIBLE_BOOT_DEVICE error may look serious, but in most cases, it’s fixable by repairing disk errors, restoring BIOS settings, or fixing corrupted system files.