On Wednesday 15 September 2010, JD wrote:
> > VMDK is the de facto standard for the virtualization field. Originally
> > form VMware, it became standard with OVF. VMDK allows split hard drives
> > and even physical raw disk, which is what you are talking about. But it
> > is like Alexey mentioned, just like .JPG and .PN
>
> Was the OP asking his question within the VMWare context?
> NO!
> He was asking within the VirtualBox context.
> In VBox, .vmdk extension is  used for describing physical drives/partitions
> and .vdi extension is used to describe and hold storage for virtual drives.

That is not entirely correct. Yes, the default extension in VirtualBox
for files holding storage for virtual disk drives is .vdi but VirtualBox
can use .vmdk files for holding storage for virtual disk drives as well.
In fact, the .vdi format implements a subset of the features of the .vmdk
format. Note for example

  VBoxManage createhd -filename foo.vmdk --size 12345678 --format vmdk

Kind regards,

Frank
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