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What do the various classes mean? Some are class 10, some class 4 etc.
Basically, speed. Higher classes are faster.
That said, manufacturers play fast and loose with the designations, so they're not always directly comparable.
Ta, need a card for a helmet cam so the higher the class the better the resolution?
Further reading,
http://en.wikipedia.org/wiki/Secure_Digital#Speeds
There's websites that carry tables of real-world tests of actual cards if you're concerned. I can't remember a URL offhand but I'm sure Google would help.
Is this for your Drift? If so, higher the number, the faster it will access it so the better it is for video/imaging.
Yup, for the DRIFT. Off to Spain with it next week so looking for a 32Gb card, already got a 16Gb in it though so i'm wondering how much run time the 16 will give me (not used it all up yet) and trying to decide between a higher spec 16Gb or a lower spec 32Gb.
EDIT: Gb not Mb.
Should be able to work it out. Run it for a few minutes (and time how long you've run it for), look at the generated file size, apply maths.
Maths? I try to avoid that, which is why i work in engineering.. 😉
Can't go wrong with [url= http://www.amazon.co.uk/SanDisk-Extreme-32GB-SDHC-Memory/dp/B005LFT3QG/ref=pd_sim_computers_14 ]this [/url].
Go for class 10, the 16gb version of that is only £26.