The format of the virtual disk generated by the virtual hard disk is vhd, which is a virtual disk file of Microsoft. Can be mounted to the system disk management, so that you can manage the disk without opening the virtual machine. Moreover, vhd is also the disk format of virtual pc virtual machine, so it can be transplanted to virtual pc. The format of virtual disk generated by virtual machine disk is vmdk, which is the disk format of vmware virtual machine. Virtual disks of vmdk can be ported to vmware.