Introduction: If your computer has multiple disks, you may want to turn off one or more of your disks. Requirements: A computer with multiple disks, access to Windows command line, and Windows operating system. Procedure: From the task-bar, open the start menu. Search for cmd. In the command line, enter the command diskpart Allow the Diskpart program to run. Enter the command list disk Example output: DISKPART> list disk Disk ### Status Size Free Dyn Gpt -------- ------------- ------- ------- --- --- Disk 0 Online 119 GB 0 B The Status column lists the Online/Offline status. Enter the command: select disk 1 but replace the ‘1’ with the desired disk number. Enter either the command offline disk or online disk More Information: Type: help within diskpart for more information.