Hello!

I have the problem with my nuvi 3790. It connects to PC with win7/8 64bit OK. But when I tries to chkdsk the internal memory through CMD the nuvi's letter (for example J disappears from My Computer, the chkdsk fails & after it nuvi letter appears agais as J:.
Why I tries to do this - the nuvi has been disconnected from PC incorrect & map is failed to start @ nuvi. No I need to check the internal memory (not on flash card!).
Maybe it's can be checked my internal test from some secret menu? But I can't find it.
Now I DON'T WANT to reflash the unit. Additionally, I think if I'll try to format the unit it will disconnects & unit become a "red brick".

Thank You!