Btrfs

linux

B-tree filesystem — a modern copy-on-write Linux filesystem with snapshotting and RAID support

Pronunciation

Correct

BUT-ur-F-S

/ˈbʌtər ɛf ɛs/

The most common pronunciation treats it as 'butter fs' — 'Btr' sounds like 'butter', then 'F-S'. The kernel documentation itself uses this form.

Source: btrfs.readthedocs.io(official spec)

Accepted Variant

B-tree-F-S

/biː triː ɛf ɛs/

An equally accepted variant spelling out the underlying data structure: 'B-tree FS'. Both forms circulate in the Linux community.