Right click on my computer
Then find DISK MANAGEMENT
You should see your ext hard drive under the list.
Right click on it, and choose CHANGE DRIVE LETTER
Choose a drive letter that is not in use.
You also might need to format like i stated above!
Did you make sure to plug it in right? Ive seen countless people fry those devices because they didnt read the 3 sentences of directions. Those converter kits usually only have one shot and if you hook it up wrong it will fry that device.