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

Using the default thick virtual disk format does not zero out or eliminate the possibility of recovering deleted files or restoring old data that might be present on this allocated space. It is not possible to convert a thick disk to a thin disk.

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 off an LSI Logic controller and share a data disk with another virtual machine using a BusLogic controller with bus sharing turned on.


On the Create a Disk page of the New Virtual Machine wizard, select the disk size in Megabytes, Gigabytes, or Terabytes.

You can increase the disk size later or add disks in the Virtual Machine Properties dialog box.


(Optional) Select a disk allocation in the Disk Provisioning panel.



Allocate and commit space on demand (Thin Provisioning)

Creates a disk in thin format.

Support clustering features such as Fault Tolerance

Supports the use of clustering features.


Select a location to store the virtual disk files and click Next.



Store with the virtual machine

The files are stored with the configuration and other virtual machine files. This choice makes file management easier.

Specify a datastore

Stores the file separately from other virtual machine files.

The Advanced Options page opens.


Accept the default or select a different virtual device node.


(Optional) Select the virtual disk Independent mode and select an option.




The disk operates normally except that changes to the disk are permanent even if the virtual machine is reverted to a snapshot.


The disk appears to operate normally, but whenever the virtual machine is powered off or reverted to a snapshot, the contents of the disk return to their original state. All later changes are discarded.

Independent disks are not affected by snapshots.


Click Next.

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

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