The R-09 records two channels at 24/48. That's 2.3Mbits per second of data
(24 bits per sample * 48,000 samples per second * two channels = 2.3 million bits per second)
Flash card speed is rated in relation to 150,000 bits, so 1X = 150,000 and
20X = 3 million bits per second. This is the maximum transfer speed when
reading from the card under optimum conditions. Writing to the card takes longer.
A good rule of thumb is to get an X rating that is double what you think you'll need.
In the case of the R-09, you need 2.3 million bits per second = 15.3X So I think
you'd be safe with a card rated at double that rate, or 30X. Actually, it's not
easy finding an SD card rated slower than 30X, so I think you're safe with the
A-Data card.
Flintstone