I stick in 64MB SanDisk microSD cards on all my cameras to date. However, it is highly recommended to use Western Digital Purple hard drives for surveillance purposes. While digging around for possible future 4/6/8TB WD Purple HD's, I also saw they have WD Purple microSD cards for camera's. I'm no memory card specialist. Has anyone tried the WD purple cards? Is there is significant difference between other cards and a WD purple card?