Using the 33 BLE as pen drive ?

Is it possible to define an area of the memory to be put aside and used to / store transfer data between the Nano and a PC ?
Just by plugging it in like a usb stick

Just defining an area of memory is not going to help you. That part is easy. You just need to tell the linker that a certain area of memory is not available for code and data.

Then you need to write code:

  • to setup a USB endpoint for a mass storage class
  • erase/write flash memory you could probably reuse some code from the bootloader
  • for a file system
  • combine this all together