Q. My computer does not recognize my USB memory device

A. Try the 3 steps below to get your computer to recognize your USB memory device

Step 1: Run the Windows Hardware and Devices troubleshooter to start the automated troubleshooting services.

Refer the article provided by Microsoft: http://windows.microsoft.com/en-us/windows7/Open-the-Hardware-and-Devices-troubleshooter

Step 2: Disable and re-enable all the Universal Serial Bus controllers (USB) controllers.

The USB controllers represent the USB ports in Device Manager.

To disable and re-enable the USB controllers, follow these steps:

1. Open Device Manager. For help click the following link from Microsoft: http://windows.microsoft.com/en-US/windows7/Open-Device-Manager
2. Expand Universal Serial Bus controllers.
Note: You might have to scroll down the list to find this item.
3. Right-click the first USB controller under Universal Serial Bus controllers, and then click Uninstall to remove it.
4. Repeat the above step for each USB controller that is listed under Universal Serial Bus controllers.
5. Restart the computer. After the computer starts, Windows will automatically scan for hardware changes and
6. Reinstall all the USB controllers that you uninstalled.

Step 3: Check if the USB drive gets detected in Disk Management. 

Check whether a Drive letter is assigned for USB drive, if not assign a drive letter. For help see the following article form Microsoft http://windows.microsoft.com/en-US/windows7/Change-add-or-remove-a-drive-letter