boolean isNotChangedAtAll = false;
try {
long offset = 0;
DiskChangeInfo dci = null;
do {
dci = vm.queryChangedDiskAreas
(vmSnap, vmdkInfo.key_, offset, baseChangeId);
if (offset == 0 && (dci.changedArea == null)) {
/*
ChangeId is not null and DiskChangeInfo.changedArea is null,