On Apr 1, 2007, at 7:20 PM, Harold Hallikainen wrote: > Interesting! Each time we get a batch of cards from a new supplier, we > test it in our product ... to make sure it works! So far, they all > have. Maybe your product is better implemented than the "reference platform" I was basing my claim upon. All SD cards are SUPPOSED to support SPI/MMC mode, but when a commercial product doesn't work with some cards, one tends to suspect the card rather than the product for some reason. It'd be interesting to understand the subtleties that lead one type of card to fail and another succeed using the same reader-side code... BillW -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist