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Old Jul 24, 2011, 5:16 PM   #1
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Default Identical Cards... Only Different?

Alright, I'm sure this has been asked before but I was going through my equipment today looking to unload a few items I no longer need. I came across two unused SanDisk Extreme III memory cards. Both are 4gb SDHC cards and both are marked as offering 30mb/sec 200x read and write speeds. The difference? One is labelled as Class 10 and the other as Class 6. More specifically, the class 10 card simply reads 30 mb/s and the class 6 card reads "30mb/s Edition."

I am aware of the SDHC performance classes and what they mean. But, in the particular case of these two SanDisk cards - both advertising 30mb/sec 200x read and write speeds - is there any functional difference assuming they are put into service in the same device? Or could these simply be two otherwise identical cards, just labelled differently because they were manufactured at different points in the evolution of standards?

Any SanDisk users out there who can speak from experience?
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Old Jul 24, 2011, 6:47 PM   #2
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Originally Posted by Biro View Post
...Or could these simply be two otherwise identical cards, just labelled differently because they were manufactured at different points in the evolution of standards?...
That's my best guess. But, you'd have to test them to find out.

Keep in mind that Class 10 wasn't a standard yet when Sandisk started making their 30MB/Second SDHC Cards (Class 6 was the fastest rating at that time). So, I suspect they just relabeled newer cards as Class 10.

Here are some tests of both Class 10 and Class 6 30MB/Second Sandisk SDHC Cards. There is very little difference between them, and I suspect the difference we do see is more due to the difference in card size (they're not all the same size).

http://www.hjreggel.net/cardspeed/sp...cards-sdc.html

But, again, you'd have to test specific cards to see if there is any difference (as I would expect some improvements to sneak in over time).
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