Sony FX 6 Quick Start Manual page 13

Recording Media: Two Codecs
The camera comes with two 160 GB CF Express A cards.
These can record XAVC I 4K up to 120 fps.
The camera has two internal codecs:
XAVC I (I Frame)
XAVC L (Long G.O.P)
Always use the XAVC I codec unless you need the extra recording time.
XAVC I is a 4:2:2 10 bit codec in HD and 4K.
Both codecs are in the cross platform .mxf container.