When you create a virtual disk, you can specify disk properties such as size, format, clustering features, and more.

For detailed information about disk types, see About Virtual Disk Provisioning Policies.


  1. On the Create a Disk page of the New Virtual Machine wizard, select the disk size.
    You can increase the disk size later or add disks in the Virtual Machine Properties dialog box.
  2. Select the format for the virtual machine's disks and click Next.
    Option Action
    Thick Provision Lazy Zeroed Create a virtual disk in a default thick format. Space required for the virtual disk is allocated during creation. Any data remaining on the physical device is not erased during creation, but is zeroed out on demand at a later time on first write from the virtual machine.
    Thick Provision Eager Zeroed Create a thick disk that supports clustering features such as Fault Tolerance. Space required for the virtual disk is allocated at creation time. In contrast to the flat format, the data remaining on the physical device is zeroed out during creation. It might take much longer to create disks in this format than to create other types of disks.
    Thin Provision Use the thin provisioned format. At first, a thin provisioned disk uses only as much datastore space as the disk initially needs. If the thin disk needs more space later, it can grow to the maximum capacity allocated to it.
  3. Select a location to store the virtual disk files and click Next.
    Option Description
    Store with the virtual machine Stores the files with the configuration and other virtual machine files. This option makes file management easier.
    Specify a datastore or datastore cluster Stores the file separately from other virtual machine files.
    The Advanced Options page opens.
  4. Accept the default or select a different virtual device node.
    In most cases, you can accept the default device node. For a hard disk, a nondefault device node is useful to control the boot order or to have different SCSI controller types. For example, you might want to boot from an LSI Logic controller and share a data disk with another virtual machine using a BusLogic controller with bus sharing turned on.
  5. (Optional) To change the way disks are affected by snapshots, click Independent and select an option.
    Option Description
    Independent - Persistent

    Disks in persistent mode behave like conventional disks on your physical computer. All data written to a disk in persistent mode are written permanently to the disk.

    Independent - Nonpersistent

    Changes to disks in nonpersistent mode are discarded when you power off or reset the virtual machine. With nonpersistent mode, you can restart the virtual machine with a virtual disk in the same state every time. Changes to the disk are written to and read from a redo log file that is deleted when you power off or reset.

  6. Click Next.
    Your changes are recorded and the Ready to Complete page opens.

What to do next

View the selections for your virtual machine on the Ready to Complete page.