See the 17th post in http://www.proxmark.org/forum/viewtopic.php?pid=42123
I used "isOk" as a flag to detect whether the sector data can be read.
However, in the newer RRG client, the "isOk" doesn't appear in the output.
So I need another way to detect whether "hf mf rdsc" returns the correct data.