> Notice the HUGE variability of read and write times? That's the killer > for apps the need consistent write performance. >=20 > I'd assume newer cards are better, but I'd love to hear back what stats > you end up getting? Herbert, there have been several posts lately about SDHC performance and SPI. Basically it is very slow and not suitable for a high-end analyser. Perhaps with RAM buffering For one application I'm even considering two microSD in parallel if I stick with dsPIC SPI (>10MHz) As you say, 50MHz might be the maximum clock speed, but it certainly isn't a reliable indicator of overall write speed Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .