220-1102 Operating Systems Practice Question
A technician is installing Windows 10 on a new computer with a GPT disk and UEFI firmware. Which file system must be used for the EFI System Partition (ESP) that contains the boot loader?
⚠ Common exam trap
Candidates often assume NTFS is required for all Windows partitions because it is the default for the OS volume, but they forget that UEFI firmware cannot natively read NTFS, making FAT32 mandatory for the ESP.
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
✓
FAT32
The EFI System Partition (ESP) must be formatted with FAT32 because the UEFI firmware specification requires it to read the boot loader files. FAT32 is the only file system that UEFI firmware universally supports for the ESP, as it is a simple, non-proprietary file system that the firmware can natively access without additional drivers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
FAT32
Why this is correct
FAT32 is correct because the UEFI specification explicitly requires the EFI System Partition to be formatted as FAT32. The firmware loads bootmgfw.efi and other UEFI boot applications from that FAT32 partition, and Windows Setup automatically creates a small FAT32 ESP (typically 100 MB) on GPT disks. This file system must be FAT32, not NTFS or ReFS, for the UEFI boot process to succeed.
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NTFS
Why it's wrong here
NTFS is the default file system for the Windows 10 operating system partition (C:) because it supports file permissions, encryption, compression, and disk quotas. However, NTFS is not valid for the EFI System Partition: the UEFI specification requires the ESP to be FAT32, and many UEFI firmware implementations only include a FAT driver. Therefore, although NTFS works for the main OS volume, it cannot satisfy the boot-file location on a GPT/UEFI install.
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exFAT
Why it's wrong here
exFAT is optimized for removable media such as USB flash drives and SD cards, allowing large files and cross-platform compatibility. It is not a standard-supported file system for the ESP under UEFI, and Windows Setup will not create or use an exFAT boot partition. The UEFI firmware expects FAT32 for storing the boot loader, so exFAT is unsuitable for this GPT/UEFI Windows 10 installation.
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ReFS
Why it's wrong here
ReFS (Resilient File System) is a file system designed for data integrity, fault tolerance, and large storage pools in Windows Server, but it is not supported for bootable partitions in Windows 10. Windows Setup cannot install or boot from a ReFS volume because the UEFI firmware cannot load its early boot components from ReFS. The ESP must use FAT32, so ReFS cannot serve as the boot partition.
Go deeper
Related to this question
Learn chapter
File Systems: NTFS, FAT32, exFAT
Key term
FAT32
FAT32 is a file system that organizes and manages how data is stored on storage devices like USB drives and memory cards.
Key term
Windows 10
Windows 10 is a personal computer operating system developed by Microsoft that combines the familiarity of Windows 7 with the modern features of Windows 8, designed to run on a wide range of devices from desktops to tablets.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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