I used to plug my device into my PC and I would see in under mycomputer.
This morning it stopped recognizing the device.
I went to ControlPanel\devices and saw: Unknow Device \ erorr.
I removed this configuration (deleted it) and plugged out and in again.
Same Unknow Device \ erorr.
Update I fixed the first issue,
but it's not over yet. I try to access the SD card in my mobile. And it's only doing the progress bar for hours
There are a lot of situations like this around the internet.
The solution involves trying and using a new cable and checking if the connectors on the micro usb plug are in the correct position (use a sharp tip knife to slightly lift the connector tongue inside the plug - again, slightly.) .
It is also reported removing all USB devices from your "devices pane" in control panel and rebooting to let Windows reconfigure them solves the problem.
In strange cases, a reboot is needed every time you connect or disconnect your device.
note: this happened to me and it was a defected cable. slightly lifting the tongue inside the plug solved it for good. no more connection problems.
note2: before plugging the device, use the built-in feature to unmount and then mount the sd card.
I went to the DeviceManager, uninstalled the device and plugged out and in again. It worked.