I have an HDVR2 that has been zippered for over a year, no troubles at all. Last weekend, I used mfstools to bless a 2nd drive for it. The 2nd drive was taken from a SAT-T60 (not zippered). This drive was also the 2nd drive in the SAT-T60. I didn't do anything to the drive before blessing it, I just pulled it from the SAT-T60 and put it in the HDVR2 (I did the mfstools blessing in between, of course).