I installed the 2016.10 maps earlier today on my 3590LMT using GE with no difficulty. I then decided to make a copy of the system and JCV files to a backup flash drive using Windows Explorer like I always do. The file transfer would start out fine and after about 30 seconds, I was getting "file not found" error messages and Windows Explorer then showed that EVERY file in my 3590 was gone. After unplugging it from the USB port and then plugging it back in, all files reappeared. To make a long story shorter, my USB cable was the culprit. Once I switched to a shorter thicker one, all problems disappeared. Long USB cable now in the trash. Interesting that the 3590 loaded the new map data with the longer USB cable but couldn't read it back out. Must require more power to read than to write. So add "switch USB Cable" to your list of possible fixes for weird problems. Hope this helps someone somewhere down the line.
Switching the USB cable has been a long standing recommendation. We usually ask if it is a thin cable and if they have a thicker one available. That thin cable isn't bad, it would work for charging phones or MP3 players but as you have discovered it can have problems supporting data transfers.
OP did not state how long the cable was but another consideration is cable length as quoted from a tech site:
"USB 2.0 provides for a maximum cable length of 5 meters for devices running at Hi Speed (480 Mbit/s). The primary reason for this limit is the maximum allowed round-trip delay of about 1.5 μs. If USB host commands are unanswered by the USB device within the allowed time, the host considers the command lost."
I have found many offices that connect printers via USB 2.0 where the cable is 10-12 meters & they complain of the device "dropping".
Connecting 2 USB cables together will also sometimes cause problems.
The original longer USB cable was 6 feet. The replacement cable was 18 inches.
When discovered, take immediate action
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