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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.

enter image description here

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

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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.

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I went to the DeviceManager, uninstalled the device and plugged out and in again. It worked.

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you might consider upvoting my answer. good you solved it. – Lorenzo Von Matterhorn Sep 28 '13 at 9:02
I'll, 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 – Elad Benda Sep 28 '13 at 9:09
that is where my answer comes in place. i had that same problem. – Lorenzo Von Matterhorn Sep 28 '13 at 9:09

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