My Trekstor 200gb external drive is not recognised by windows 7.

Hi,

This issue can be caused if any of the following situations exist:

·       The currently loaded USB driver has become unstable or corrupt

·       Your PC requires an update for issues that may conflict with a USB external hard drive and Windows

·       Windows may be missing other important updates hardware or software issues

·       Your USB controllers may have become unstable or corrupt

·       Your external drive may be entering selective suspend

·       Your PC motherboard may need updated drivers

1.       Were there any recent changes made to the computer prior to the issue?

I would suggest you to follow the steps provided and later update us on the status of the issue.

Method 1: Try connecting the device in different USB port and check the issue persists.

**Method 2:**Try to run the hardware troubleshooter and check what the issue is and fix it accordingly.

Follow the link given below open hardware troubleshooter.

http://windows.microsoft.com/en-us/windows7/Open-the-Hardware-and-Devices-troubleshooter

**Method 3:**Error: “USB Device not recognized” when you try to access a USB external hard drive.

http://support.microsoft.com/kb/2654149

For any Windows related issues please feel free to contact us and we will be glad to help.