Thread: 3597 LMT problems connecting to PC

Sorry for delay, but my Nuvi "hit the road" yesterday, because of one of my friends emergency.
I'll continue with test in the weekend.
Yesterday I have made NonVol clear several times because on first and second attempt the trips were not erased or were partially erased and unit also said "Can't unlock maps" which is not possible, because I have LM.
After third attempt of clearing NV PC start to detect the unit without any problem and unit started to behave normally. Have no time to check additionally, but GE also started to detect unit and to start with unit connection to the PC.
So, at this stage, I can say that there are always at least two reasons for not detecting unit from PC - PC software problems and unit FW/SW problems.
In my impression up to the moment 3597 FW/SW is more vulnerable that 3590 for example.
I did not mention it up to now, but before clearing NV, when I connect unit to PC I have saw 3 USB generic devices:
Garmin - unit
SD card
and some very strange logical device - H:\ - which disc volume is 128 MB. It is shown only when unit is connected to the PC....
I have no such a card/disc. No external device connected at all. But it is accessible and I have RW permissions. Even GE made a backup on it.
I'm not an PC expert, but I have enough experience with PC to know how to find some logical discs, directories etc. Checked all computer - nothing.
Any idea what could be that mysterious drive H:\ ?