>> This is seen as 7 fast sector writes followed by 3 slow ones > It is related to the SDcard internal buffer. Hi Nicola. That doesn't explain to me the consistent 7 fast 3 slow pattern. I would have expected something more regular, perhaps not a '10' grouping. If it was 1-1, 7-1 or 15-1 maybe, more 'hex' Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .