You have to make sure your equipment Hardware will take big Cards, Do you mean Gig or Mb

I think you are talking about 30Mb write speed.

But as to size in Gig check your info on the Hardware you are using on max size you can use in them. This is a must for them to work, you cannot go over the size they say

Woodchip.just looked at my canon camera and it has a '4GB SDHC then it has a number 2 enclosed in a circle if you understand what i mean.So what does that 2 stand for is it for speed or what?,if its for the speed of the card maybe a SD card 4GB with a higher number than 2 would be faster??.thanks.

Thanks 'woodchip'very helpful info. Many thanks once again,c.

I've been away for a few days and was able to try out my new CanonS95 compact which was rated highly for movies as well as stills but does say in the mountain of instructions that if you don't use a fast card with good capacity the camera will have to pause during movie making to allow the card to catch up loading the scene.

Speed does not seem to be so important with stills unless you are taking in rapid succession, but my wife did have this yesterday trying to take multiple shots of granddaughter on horseback, she was pressing too fast for pictures to load, but she has the standard card, no card was supplied with my camera and I don't know what was in my previous Canon cos some Ba*rd stole it from my bag when my back was turned!

I was shooting a mixture of still and movie and had no trouble, but my card is a Sandisk Extreme Pro 45MB/s SDHC1

As to Ian picking up my description of the car colour, I did mean pee green, probably rhino or similar, but you will know the colour when you see it, whoever chose it must be vision defective, it must knock hundreds off its selling value.