> Have you looked at the signals while reading/writing the card > using a card reader & PC to see what the timing is like under > this condition ? On the to-do list. Nicola might have a point about the buffers but the fact remains that a writer can sustain > 7Mbs with this very same card Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .