Advertisements We have investigated Hard Drives, with great information from TIVO FORUM MEMBERS. Those members guided me regarding RPM Recommendations, CMR Technology and some of the Hard Drives. We are now narrowed to two choices: 1. WD RED PLUS 2. WD PURZ The reasoning behind our question is this. The TIVO FORUM, THE GURU WHO DEVELOPED MFSR, back in a 2015, "indicated that the WD PURZ may not be a good choice, but the WD RED maybe a better choice". We were wondering if this holds true, today? I understand everything regarding Upgrading a TIVO ROAMIO Hard Drive is "Proceed with Caution, No Guarantee Implied".