Which is the standard file extension used by VMWare for virtual hard drive images?

Which is the standard file extension used by VMWare for virtual hard drive images?

• VHD (Virtual Hard Disk)
• VDI (Virtual Disk Image)
• VMDK (Virtual Machine Disk)
• HDD (Hard Disk Drive) 

 

EXPLANATION

VMDK is the standard used by VMWare and is supported by several other virtual hypervisors.  It can contain the entire virtual machine, including settings.
VHD is the standard typically used by Microsoft Hyper-V.  It represents a single virtual drive, and does not contain configuration settings for the rest of the virtual machine.
HDD is the standard for Parallels.
VDI is the standard and default for type-2 hypervisor VirtualBox; it can use and create all four of the listed formats, however.