diff --git a/Rsconscript b/Rsconscript
index fbad203..1323956 100644
--- a/Rsconscript
+++ b/Rsconscript
@@ -208,7 +208,35 @@ end
 
 # See README.md for how to set up VirtualBox for HOS.
 task "mk-vmdk", desc: "Create VirtualBox VMDK virtual drive for HOS" do
-  sh %W[VBoxManage internalcommands createrawvmdk -filename HOS.vmdk -rawdisk #{File.expand_path(hello_env.expand("^/HOS.img"))}]
+  path = File.expand_path(hello_env.expand("^/HOS.img"))
+  sectors = File.stat(path).size / 512
+  File.binwrite("HOS.vmdk", <<EOF)
+# Disk DescriptorFile
+version=1
+CID=1d1c3615
+parentCID=ffffffff
+createType="fullDevice"
+
+# Extent description
+RW #{sectors} FLAT "#{path}" 0
+
+# The disk Data Base 
+#DDB
+
+ddb.virtualHWVersion = "4"
+ddb.adapterType="ide"
+ddb.geometry.cylinders="8"
+ddb.geometry.heads="16"
+ddb.geometry.sectors="63"
+ddb.uuid.image="03783b5a-7587-4d8b-ad04-9d70f70a94c2"
+ddb.uuid.parent="00000000-0000-0000-0000-000000000000"
+ddb.uuid.modification="00000000-0000-0000-0000-000000000000"
+ddb.uuid.parentmodification="00000000-0000-0000-0000-000000000000"
+ddb.geometry.biosCylinders="8"
+ddb.geometry.biosHeads="16"
+ddb.geometry.biosSectors="63"
+EOF
+  #sh %W[VBoxManage createmedium disk --filename=HOS.vmdk --variant=RawDisk --format=VMDK --property RawDrive=#{File.expand_path(hello_env.expand("^/HOS.img"))}]
 end
 
 # See README.md for how to set up VirtualBox for HOS.