diskSpec.setDevice(vd);
vd.setKey(0);
vd.setUnitNumber(0);
vd.setControllerKey(cKey);
VirtualDiskFlatVer2BackingInfo diskfileBacking =
new VirtualDiskFlatVer2BackingInfo();
String fileName = "["+ dsName +"]";
diskfileBacking.setFileName(fileName);
diskfileBacking.setDiskMode(diskMode);
diskfileBacking.setThinProvisioned(true);
vd.setBacking(diskfileBacking);
return diskSpec;
}