LFCS Storage Management Practice Question
Which THREE of the following are valid Linux filesystem types that can be used for root partitions on a modern Linux system?
⚠ Common exam trap
Test-takers frequently confuse filesystems that Linux can read/write (like NTFS or FAT32) with native Linux filesystems that are suitable for root partitions, or they may overlook that Btrfs, while less common, is fully supported and valid for root on modern distributions.
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
✓
XFS
XFS (A) is a valid Linux native filesystem, long supported as a root filesystem and the default on RHEL/CentOS, so it is correct. Btrfs (D) is a modern Linux copy-on-write filesystem with full root-partition support (including subvolumes and snapshots), making it correct. ext4 (E) is the long-standing default Linux filesystem and fully supports being mounted as the root partition, so it is correct. NTFS (B) is Microsoft's Windows filesystem and FAT32 (C) is a legacy FAT variant; although Linux can mount them via drivers, neither is a valid native Linux filesystem type for a root partition on a modern system.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
XFS
Why this is correct
XFS is a mature, high-performance 64-bit journaling filesystem, and every mainstream distribution supports it as a root partition, including GRUB and initramfs tooling. It satisfies the stem's requirement for a valid modern Linux root filesystem type.
- ✗
NTFS
Why it's wrong here
NTFS is Microsoft Windows' native filesystem; the Linux kernel can mount it via ntfs3 or FUSE drivers, but it lacks the POSIX permissions, ownership and symlink semantics a root partition requires, and no mainstream distribution installs onto it. It is correct for sharing data with Windows systems.
- ✗
FAT32
Why it's wrong here
FAT32 stores no POSIX ownership, permissions or symlinks, and caps files at 4 GiB, so it cannot host a Linux root partition. It is correct for EFI System Partitions and removable media shared across operating systems. Modern root partitions use ext4, XFS or Btrfs.
- ✓
Btrfs
Why this is correct
Btrfs is a copy-on-write filesystem with snapshots, checksums and subvolumes, and distributions such as openSUSE and Fedora support it as a root partition. It satisfies the stem's requirement for a valid modern Linux root filesystem type.
- ✓
ext4
Why this is correct
ext4 is a journalling filesystem with extents, delayed allocation and support for volumes up to 1 EiB, and every mainstream distribution's installer offers it for the root partition. It remains a valid, fully supported root filesystem type on modern Linux systems.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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