XFS

linux

High-performance 64-bit journalling filesystem developed by SGI, used widely on Linux servers

Pronunciation

Correct

X-F-S

/ɛks ɛf ɛs/

XFS is an initialism; each letter is spelled out. The 'X' is always pronounced as the letter name, never as 'eks' combined.

Source: www.kernel.org(official spec)