I just realized my GH2 SDHC memory card is only a 20mps card. IF the GH2's 24p mode records at 24mps then its data rate exceeds the memory card. Yet i am able to record video w/o any warnings. I wonder though, how this is working? Is the camera making a sacrifice?

The answer is most cards from a reputable manufacturer exceed the advertised specification. To put it another way, the advertised specification is the absolute MINIMUM that the card will do. The manufacturer has built in a margin of error. So while skating on the edge, so far the card has been fast enough to let you get away with it :-) But now that you realise that is the situation, are you comfortable with that?

Thanks. Nice answer. Good to know... I was just wondering if it was dropping frames to accomplish the recording or something. I did notice that when shooting RAW stills after 2 or 3 shots it freezes up for about 20 seconds while saying writing to card. Guess thats where a faster card helps for sure.

Look carefully and you will see the card is rated at 20mB/sec not 20mb second. 20mB/sec is about 160mb/sec which is much greater than what the camera requires.

Yes, megabits and megabytes. The codec is in megabits (1/10th the size)

Yes, megabits and megabytes. The codec is in megabits (1/10th the size)
Actually, 1/8 the size. A byte is a group of 8 bits.

Yeah but 1/10th sounds better! I was rounding to make a point but that is wrong as it is important to get the facts straight.

I just realized my GH2 SDHC memory card is only a 20mps card. IF the GH2's 24p mode records at 24mps then its data rate exceeds the memory card. Yet i am able to record video w/o any warnings. I wonder though, how this is working? Is the camera making a sacrifice?

Don't forget that your recording is compressed, so perhaps it's 24Mbps when played out, but less than that as compressed data?

The video is played out uncompressed via HDMI. At 1080p24 the data rate is about 100MB/sec (800Mb/sec). The rate of 24Mb/sec is the compressed rate.