What file system does Windows 11 use by default?

Windows 11 uses NTFS by default as its primary file system. NTFS, short for New Technology File System, was designed by Microsoft for reliability, security, and support for large disks and files.

NTFS became the standard file system for consumer Windows installations during the Windows XP era, replacing FAT32 on typical system drives. It supports permissions, encryption, compression, journaling, and file sizes far beyond FAT32's 4 GB per-file limit. Those capabilities make it suitable for the operating system partition, where Windows must manage protected system files and user accounts.

FAT32 is a common mix-up because it remains widely supported by cameras, game consoles, and removable drives, but it is not the normal Windows 11 system format. exFAT is optimized for flash storage and cross-platform removable media, while ReFS is intended mainly for specialized storage and server workloads. Windows 11 may read or write other formats, but a standard installation normally places its system volume on NTFS.