Unraid VM Disk Conversion
Unraid (or more accurately qemu) is able to convert disk images from VDI or VMDK to RAW. This is often required when migrating a VM from Virtualbox or VMWare over to Unraid.
The command below will convert the VDI file to the a RAW image:
qemu-img convert -p -f vdi -O raw VirtualBox.vdi Unraid.img
Much the same, the following command does this for VMDK file:
qemu-img convert -p -f vmdk -O raw VMWare.vdi Unraid.img
That's about it really.