See for example: http://www.beyondlogic.org/usbnutshell/usb4.htm#Bulk On Fri, Oct 2, 2009 at 5:55 PM, Marcel Birthelmer wrote: >> The max for bulk is 64 bytes per transfer. > > Not for high speed (USB2.0 only). There, it's 512 bytes, to reduce overhead. > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist