List DISK partitions:
VBoxManage.exe internalcommands listpartitions -rawdisk \.PhysicalDrive0
VBoxManage.exe internalcommands listpartitions -rawdisk \.PhysicalDrive1
VBoxManage.exe internalcommands listpartitions -rawdisk \.PhysicalDrive2
Create raw VMDK:
VBoxManage internalcommands createrawvmdk -filename K:vdiskwhole.vmdk -rawdisk \.PhysicalDrive1 -partitions 1,2,3,4
VBoxManage internalcommands createrawvmdk -filename K:vdiskpart1.vmdk -rawdisk \.PhysicalDrive1 -partitions 1
VBoxManage internalcommands createrawvmdk -filename K:vdiskpart2.vmdk -rawdisk \.PhysicalDrive1 -partitions 2
VBoxManage internalcommands createrawvmdk -filename K:vdiskpart3.vmdk -rawdisk \.PhysicalDrive1 -partitions 3
VBoxManage internalcommands createrawvmdk -filename K:vdiskpart4.vmdk -rawdisk \.PhysicalDrive1 -partitions 4
Manage ram VMDK in Graphics VirtualBox Manager as usual.