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How to ensure your's is a genuine card
on 2 May 2013
You will most likely get a genuine card, but there are far too many fakes about so its essential you test your card on receipt to be sure, however some fakes will pass some of the test programmes, so test with ChkFlsh, Crystal Disk Mark & especially H2testW. H2testW tests the full capacity of the card, so will catch any using aliasing to fake larger than real capacity. A card with indicated capacity but high error rate/slow write speed indicates a 'ghost run' fake which won't last very long.
A 32GB card should have a formatted capacity of around 30GB, format in FAT/FAT32 only (NTFS shortens life of flash media & wont improve performance)
A class 10 card must have a write speed of 10MB/s minimum (large files) the first result in Crystal Disk Mark should indicate that. Cards are now appearing with the UHS-I class (marked with a 1 inside a U) these have higher clock rates so higher performance and are at least class 6 speed.
Read speeds should be over 12MB/s and getting toward 48MB/s on a USB3 UHS-I class reader with these.
If your cards speed test comes just below spec, that's a fail, don't assume 'close enough'.
SDHC cards have a maximum capacity of 32GB and SDXC a maximum capacity of 2TB but check your device is compatible with SDXC before choosing those over these SDHC cards.