Vmware Virtual Machine Disk File is a format specification. It is used with VMware virtual machine files. A complete and independent virtual machine using VMware virtualization products or other platforms which support VMDK files such as Sun XVM, QEMU, or VirtualBox. The most important advantage of vmdk file is simplicity and accessibility and can be easily moved between servers by making use of live migration feature in virtualization platform. And one of the biggest drawback of VMDK is that extra effort required for the recovery of lost data.