It can be due to an upgraded Window, corrupted drive, unsuccessful connection, etc.
Many of us experience it one time or another. Sounds like you? Don't worry! Whether you are working with your old external hard drive or plugging a new one, there is a possibility that the drive fails to show up. Can anyone help how to fix Toshiba external hard drive not working? Since then, it does not recognize the hard drive. Last night while working on my computer, it suddenly got shut down because of power off.