I have been using a non-commercial, 8GB CompactFlash card with my pfSense install for 2 years with no problems, and I run the full pfSense rather than the NanoB

I have been using a non-commercial, 8GB CompactFlash card with my pfSense install for 2 years with no problems, and I run the full pfSense rather than the NanoBSD version. I do not run extra services like Squid or Snort, so most of my "writes" are probably within my massive 1GB of RAM.