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When a device, such as a hard drive, is “mounted” to a computer, 
that means the computer has established a communications link 
with it. When you unmount a device, the communications link is 
severed and the computer can no longer access it.
Never turn off a hard drive or disconnect any cables while it is 
mounted. You may lose data or damage the drive.
1. In the system tray at the bottom of your screen, click the safely 
remove/icon (the icon with the green arrow). A pop-up message will 
appear with a list of devices connected to your computer.
2. Select the Toshiba Drive. After a few seconds the Drive will 
unmount and Windows will give you a message that it is safe to 
remove the device.  
3. Click OK. You can then safely turn off the Drive.
If you turn off the Drive after you shut down your computer, you 
do  not  need  to  manually  unmount  it.  The  Drive  will  unmount 
automatically when the computer shuts down.
How to unmount and turn off the Drive