220-1102 Software Troubleshooting Practice Question
A technician is troubleshooting a Windows 10 workstation that repeatedly shows a message stating the operating system could not be found. The drive is detected in UEFI/BIOS, and the technician suspects the boot configuration is damaged. Which command should the technician run from the Windows Recovery Environment to rebuild the Boot Configuration Data store?
⚠ Common exam trap
Many exam-takers confuse MBR repair with BCD repair, since both are bootrec subcommands but affect different boot architectures and components.
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
✓
bootrec /rebuildbcd
When the Boot Configuration Data store is damaged, Windows cannot locate the operating system even though the disk is healthy. The bootrec /rebuildbcd command scans for installations and reconstructs the BCD, directly addressing the symptom. The other commands either repair the wrong boot component, destroy data, or check disk surface errors rather than the boot database.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
chkdsk /r
Why it's wrong here
chkdsk /r locates bad sectors and recovers readable information, which helps with file system corruption. However, it does not rebuild the Boot Configuration Data store, so it will not fix an OS-not-found error caused by a damaged BCD. It may be useful after other repairs but is not the correct command here.
- ✓
bootrec /rebuildbcd
Why this is correct
This command scans all disks for Windows installations and rebuilds the Boot Configuration Data store, which is exactly what is needed when the BCD is damaged and the OS cannot be located at boot. It is the targeted repair for this symptom on both BIOS and UEFI systems.
- ✗
diskpart /clean
Why it's wrong here
diskpart with the clean parameter wipes partition information from the selected disk. Running it would destroy the existing partitions and data, turning a boot configuration problem into total data loss. It is never an appropriate repair step when the drive is healthy and detected but merely fails to boot.
- ✗
bootrec /fixmbr
Why it's wrong here
bootrec /fixmbr writes a new master boot record compatible with the current partition table. On a UEFI system using GPT, the MBR is not the active boot mechanism, and this command does not rebuild the Boot Configuration Data store, so it would not resolve an error about the operating system not being found.
Go deeper
Related to this question
Learn chapter
Windows Recovery Tools
Key term
Recovery
Recovery is the process of restoring systems, data, and operations after a security incident, failure, or disaster to return to normal functioning.
Key term
Unified Extensible Firmware Interface
UEFI is the modern replacement for BIOS that controls how a computer starts up and loads the operating system.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This 220-1202 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1202 exam.