if (isoVBD == null) {
throw new CloudRuntimeException("Unable to find CD-ROM VBD for VM: " + vmName);
} else {
// If an ISO is already inserted, eject it
if (!isoVBD.getEmpty(conn)) {
isoVBD.eject(conn);
}
// Insert the new ISO
isoVBD.insert(conn, isoVDI);
}