easyMultiple Choice
FC0-U71 Practice Question: Which file system is commonly used on external…
Which file system is commonly used on external USB drives for compatibility between Windows and macOS?
⚠ Common exam trap
Many exam-takers assume NTFS is fully compatible with macOS because macOS can read NTFS drives, but they overlook the lack of native write support, making FAT32 the safer choice for true cross-platform read/write compatibility despite its age and limitations.
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
FAT32 is the correct answer because it is natively supported by both Windows and macOS for read and write operations, making it the most compatible file system for external USB drives that need to be used across both platforms. Unlike NTFS (which macOS can only read by default) and APFS (which Windows does not natively support), FAT32 has been a universal standard for cross-platform storage since the 1990s, though it has a 4 GB maximum file size limit.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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APFS
Why it's wrong here
APFS is Apple's native file system, and Windows cannot natively read or write it, so a USB drive formatted this way fails the cross-platform requirement. It is tempting because APFS is the modern default on macOS, and it would be the correct choice for a drive used exclusively with Macs.
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ext4
Why it's wrong here
Windows cannot natively read ext4, so a user plugging the drive into a Windows PC would need third-party drivers or see nothing. It is tempting because ext4 is the default Linux file system, and it would be the right pick for a drive used only across Linux machines.
- ✓
FAT32
Why this is correct
FAT32 is natively readable and writable by both Windows and macOS, satisfying the cross-platform compatibility constraint. Its 4 GB per-file limit and lack of journaling are irrelevant here; exFAT would also work, but FAT32 remains the commonly cited interoperable choice for external USB drives.
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NTFS
Why it's wrong here
macOS mounts NTFS read-only without extra software, so files cannot be written from a Mac. It is tempting because NTFS is Windows' native file system with journaling and large-file support, making it correct for Windows-only internal drives.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This FC0-U71 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 FC0-U71 exam.