>> Sometime I will put the analyser on it to see exactly how it does >> that. Presumably it will be in the native 4-bit mode >=20 > I suspect you will also find the USB is doing 480 MB/s No doubt. I'm just impressed that this particular Class 4 (> =3D 4MB/s) card can sustain > 7MB/s writes, which is better than minimum spec for a Class 6. JFTHOI I'd give 4-bit a go when I'm happy with SPI Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .