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If the drive functions correctly on another computer, the Windows USB drivers are corrupted or missing. If Code 28 appears, you will need to test the drive on another computer. You can begin a replacement request at our Warranty Services Page.

If the drive does not work on the 2nd computer, the drive is probably defective. Verify by trying the drive with another USB cable or port, or on another computer. If Code 10 appears, the drive has most probably failed.

If a yellow ! icon is displayed next to it, double-click on the drive.Ī Properties window will appear and will probably say "This device is not working properly" and will give either (Code 28) or (Code 10). The drive should appear as a USB Mass Storage Device. If the drive is not seen there, check under Universal Serial Bus Controllers (if the drive is connected via USB). Then choose Device Manager from the left column. If it is displayed there, you can troubleshoot it inside the Disk Management ( for Windows Vista/7). It should be "Disk 1" or some other number (but not Disk 0). Try to find the external drive in the lower window. It is always a good idea first to check Windows Disk Management before the Device Manager.Ĭhoose Disk Management from the left column. Troubleshooting when Windows Device Manager displays a yellow ! icon next to an external drive or marks it as an Unknown Device.