Windows & BSOD · critical

How to fix0x0000007B

INACCESSIBLE_BOOT_DEVICE

What this error means

INACCESSIBLE_BOOT_DEVICE is a critical-severity Windows operating system issue. Windows lost access to the root system partition during startup. Typical causes include change disk controller mode in BIOS (IDE -> AHCI/RAID) and corrupt storage driver. Work through the steps below in order.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Change the SATA mode in the BIOS back to the original

Change the SATA mode in the BIOS back to the original.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Run Startup Repair

Run Startup Repair.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Try booting into safe mode

Try booting into safe mode.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • Change disk controller mode in BIOS (IDE -> AHCI/RAID)
  • Corrupt storage driver
  • Corrupted partition table