How to use DiskPart to format hard drive If you face a problem in formatting the system hard disk, external hard drive, or the USB Flash drive, then using DiskPart, you can easily wipe them out.

Read more at the link below. Pro tip: Use Windows 8's Format command to perform a secure disk wipe | Tech Republic Photo by Dan Grebb.

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.

You can format an existing hard drive partition with the FAT16 file system by running the "sudo mkdosfs -F 16 device" command, replacing "device" with the path of the partition device on your system.

You can format your external hard drive or USB drive using PowerShell. Follow this tutorial to change drive letter, create partition, etc.