220-1102 Software Troubleshooting Practice Question
A technician is troubleshooting a Windows 10 computer that displays a 'Blue Screen of Death' (BSOD) with error code 0x0000007B (INACCESSIBLE_BOOT_DEVICE) after a system restore. What is the most likely cause?
⚠ Common exam trap
A common mix-up: candidates confuse this error with a corrupted boot configuration data (BCD) or MBR issue, but the 0x0000007B code specifically points to a storage driver problem rather than a bootloader corruption.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Outdated or incompatible storage controller driver
The 0x0000007B (INACCESSIBLE_BOOT_DEVICE) BSOD after a system restore indicates that the Windows boot process cannot access the system partition. This is most commonly caused by an outdated or incompatible storage controller driver (e.g., SATA, AHCI, or RAID driver) that was replaced or reverted during the restore, preventing the OS from communicating with the disk. The error occurs because the boot loader cannot load the necessary driver to read from the storage device.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Corrupted system files
Why it's wrong here
Corrupted system files typically manifest as stop errors like 0xC000021A or 0xC0000221, where Windows fails to validate critical files during the boot process after the storage stack is online. In contrast, 0x7B (INACCESSIBLE_BOOT_DEVICE) points specifically to a failure of the Windows boot loader to communicate with the storage controller or driver, not to file-level corruption. A system restore that corrupts system files would produce a different blue screen, not this particular one.
- ✗
Incorrect boot mode (BIOS vs UEFI)
Why it's wrong here
Incorrect boot mode (BIOS vs UEFI) can cause 0x7B because the firmware changes how the boot device is accessed, but this setting is stored in NVRAM/CMOS and is completely independent of Windows System Restore points. System Restore only modifies OS files, registry keys, and drivers—it cannot change the boot mode. If a user manually switched from UEFI to legacy BIOS or vice versa, the system might fail to see the boot disk, but that would not result from a restore operation.
- ✗
Faulty RAM
Why it's wrong here
Faulty RAM produces memory-related stop codes such as 0x1A (MEMORY_MANAGEMENT) or 0x50 (PAGE_FAULT_IN_NONPAGED_AREA) because corrupted memory contents disrupt paging or kernel structures. The 0x7B error occurs while the storage stack initializes, a process that relies on controller hardware and drivers rather than on RAM integrity. If the RAM were bad, the system restore process itself would likely have crashed or thrown errors long before reaching the point where the boot device becomes inaccessible.
- ✓
Outdated or incompatible storage controller driver
Why this is correct
System Restore reverts drivers to the state saved at the restore point, and if the storage controller driver (e.g., AHCI, NVMe) is rolled back to an older or incompatible version, it may fail to recognize the disk geometry or issue the correct commands. This prevents the kernel from mounting the system volume, triggering INACCESSIBLE_BOOT_DEVICE (0x7B). This is a common post-restore failure because driver updates and restore points are not always synchronized, and the hardware controller may require a driver newer than the one in the restore point.
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
Go deeper
Related to this question
Learn chapter
PXE Boot and Windows Deployment Services
Key term
Redundant Array of Independent Disks
A technology that combines multiple physical hard drives into a single logical unit to improve performance, reliability, or both.
Key term
Serial Advanced Technology Attachment
Serial Advanced Technology Attachment (SATA) is a computer bus interface used to connect storage devices like hard drives and solid-state drives to a computer's motherboard.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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