The Block Pin number is the parental guide # you entered to block certain channels or programs. The default is "0000" if you never set up parental controls in the DVR.
I reformatted my HDD yesterday and all appears good for now, I'm wondering if this fix holds however. Those of you that did the reformat a few weeks ago - is your DVR still showing an accurate # of recording space used ?
Lastly, I was surprised on how quick the DVR HDD reformatted. It was about 5 minutes and I was expecting it to take hours.