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FAQ
Q: After I drag & drop my bin file in the Nucleo or Disco board disk on my Laptop, it disappears after the flashing is completed ?
A: The mass storage device of the STLink is a virtual disk. There is no storage memory beside the the one from the microcontroller. So it's normal that once programmed into the MCU the binary disappears from the virtual disk. MBED uses this trick to make drag an drop programming seamless on all platforms that support mass storage device.
Q: I cannot use the Nucleo D0/D1 pins to drive a USART device ?
A: The D0/D1 pins are not available per default, because they are used by the STLink. If you want to use them you need to close SB62/SB63 and open SB13/SB14 solder bridges. Doing this, the printf in your code will not work anymore. You will have to create a Serial object (i.e. Serial pc(PA_9, PA_10);) and uses instead pc.printf.