The Disk Management tool of Windows is also available to partition devices. The steps below tell you what you need to do in order to partition a USB drive using Disk Management.

We have a separate tutorial on how to partition the startup drive while it’s being used to boot your Mac. That tutorial can also be used to partition an external hard drive that has data on it.

A workshop, where we show you how to create a secret partition on your USB pen drive which can be accessed only on your PC There is no way you can partition USB pen drives. They show up as a ...

If you've got a larger USB hard drive, you can use the same process as above to open Disk Utility and create a second partition on the drive for your testing. Installing OS X ...

Jesus Vigo reviews the process to create a mutliboot USB drive used to install multiple versions of OS X.