ok. I know how to copy/erase stuff from a FS.
What I don't 'know' (never used it) is how USB works. From what I seem to understand, USB is handled by the kernel, and I can access a device just as an ordinary FS if there is a kernel driver for that device, is that correct ?
If so, it all boils down to finding the driver... or writing my own ( but I might "peter plus haut que mon cul" as we say in France :-) )