VDI
Virtual Disk Image, is the default disk format for the open-source Oracle VM VirtualBox
VHD
Virtual Hard Disk and is the standard disk format for Microsoft’s now-defunct virtualization products, including Microsoft Virtual PC and Virtual Server.
VMDK
VMDK, or Virtual Machine Disk, is a previously proprietary virtual disk-drive format built specifically for VMware virtual appliances, including VMware Workstation, VMware Player and VMware Fusion. It has since become an open format and is now widely used across different virtualization platforms, including Hyper-V and VirtualBox.
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