Like a physical computer, a VMware GSX Server virtual machine stores its operating system, programs and data files on one or more hard disks. Unlike a physical computer, GSX Server gives you options for undoing changes to the virtual machine's hard disk.

The New Virtual Machine Wizard creates a virtual machine with one disk drive. You can use the virtual machine settings editor (VM > Settings) to add more disk drives to your virtual machine, to remove disk drives from your virtual machine or to change certain settings for the existing disk drives.

The following sections describe the choices you can make in setting up hard disk storage for your virtual machine.