Oracle VM VirtualBox supports the following types of disk image files: VDI. Normally, Oracle VM VirtualBox uses its own container format for guest hard disks.
VirtualBox is compatible with both of them. VDIs are the format that Virtualbox creates by default, while VHDs are the format that Microsoft Virtual PC creates.
VDI, VMDK, and VHD all support dynamically allocated storage. VMDK has an additional capability of splitting the storage file into files less than 2 GB each.