The recording speed rating commonly used by CF and SD cards is
expressed in terms of "X", where 1X =150,000 KB (kilobytes) per
second. A typical CF or SD card sold today might be rated at 40X, or
(150,000 * 40) = 6MB (megabytes) per second.
SDHC uses new terminology to describe the speed of the card. A Class
2 card can record a data stream up to 2MB (megabytes) per second.
Class 6 is able to record 6MB/sec. That's a lot easier to understand
than the "X" ratings.
If you're recording two channels of audio at 24/96, you're creating a
data stream of 576,000 bytes per second. That's easily within the
capacity of a Class 2 SDHC card, or a 10X SD or CF card (if there were
such a card). So you gain no advantage using a faster card while
recording. A faster card will help by reducing the time you wait
while transferring data from the flash card to your PC, however.
--oryoki
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