Definition

VMDK file (virtual machine disk file)

This definition is part of our Essential Guide: FAQ: Backing up virtual servers today
Contributor(s): Julia Anderson

VMware Virtual Machine Disk File (VMDK) is a format specification for virtual machine (VM) files. A file with a .VMDK file extension is essentially a complete and independent virtual machine.

VMDK was originally developed by VMware, but is now an open file format, competes with the Microsoft Virtual Hard Drive (VHD) disk format and the two are not directly compatible. Third-party tools, such as the VMDK to VHD Converter, exist to aid in the conversion process.

This was last updated in December 2012

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