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Originally Posted by dahawthorne
I bought a 4GB SD & an 8GB CF from eBay, both Sandisk Extreme III, but later received warnings that the SD was a counterfeit and wouldn't give me the full speed. The packaging is supposed to be a good indicator - different graphics, and maybe the CF is a forgery too.
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Unfortunately there are a lot of "forgeries" about on ebay. Also watch out for the fact that some of the high capacity cards aren't what they advertise either - try copying one file of just below the quoted capacity to it. (I know - if you are trying this you have already bought it and it's too late!). There is a very good guide on the ebay site to help identify conterfeit cards.
If the price looks too good to be true - then be very wary - especially from far eastern suppliers. I have a genuine SANdisk Extreme III 4GB card that I bought with and use in my digital camera - it is very quick - it allows continuous shooting for (nearly) ever. But I don't see much difference when I tried it in my X51v - so I stick to my cheaper, slower 2GB cards for this.
