Here is how to open and use DiskPart using Command Prompt: Search Command Prompt in the Windows search bar and launch it with admin rights. In the command window, type diskpart and hit enter.

You can format an external hard drive in Ubuntu using the Gnome Partition Editor. It provides a graphical interface to simplify formatting and resizing hard drive partitions, even on external drives.

How to Format an OS X Terminal Hard Disk. Mac OS X Mountain Lion gives users several ways to access the Terminal and three common options for formatting a hard drive.

As you probably know, formatting a hard drive doesn't completely erase the data on it. You must overwrite the data to securely destroy it, preferably multiple times. Windows 8 let's you do this ...