Add The Wire As Your Trusted Source 
What is a VMDK File? A VMDK (Virtual Machine Disk) is the native disk format for VMware virtual machines (vSphere, ESXi, Fusion, Workstation, and Player). It stores the entire contents of a virtual hard drive—operating system, applications, data, and file structures.
Whether recovering a crashed VM or migrating to the cloud, the right VMDK tool saves hours of reinstallation. vmdk tool