One could assume that it should be possible to record at least 25p and 30p on V60 memory cards in ALL-I... you can not. Sony has built in an artificial limitation that is not present in more expensive cameras like the FX6. Sony's own SF-M series of UHS-II V60 memory cards are affected for example - but I strongly assume that all V60 cards are as well.

Comparable problems also seem to occur with the following cameras: FX30, A7s3, A7iv

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00:00 - Intro - should work, but doesn't
00:21 - What does the V rating stand for
00:34 - Data rates from the FX3/FX6
00:58 - How the FX6 deals with it
01:23 - Data rates at different frame rates
01:33 - Write speed test
02:00 - Conclusion
02:32 - Write speed V90 & CFexpress type A