Originally Posted by GeoffR
The main idea seems to be that class 6 and 10 cards have been optimised for large sequential read/write operations at the expense of small random read/writes, but much operating system performance depends on small random writes (such as updating the KoboReader sqlite database).
This comparison for example suggests that class 4 scandisk and silicon power cards are up to 100x faster than patriot class 10 cards for some small random write operations:
Ahh, yes. Of course. I'm silly.
Then I'd recommend following your own reasoning and go with the benchmarks, looking for good random read/write speeds ^.^
As I said earlier, I haven't noticed any difference between the Class 10 Patriot card I have now and the Class 4 SanDisk card I had earlier though.
WOW though. Those Class 4 cards make a HUGE difference in the random write tests.