Butch,
If you do a search on “Bad Logging” from the forum home page, you get quite a few hits!
This thread in particular has several suggestions.
Pixhawk bad logging error
- Try formatting your SD card
- Format the SD card with a FAT32
- Try a different SD card…replacing the vendor supplied SD card
- Go to mission planner, open full parameter list and make setting to its default; 65535
Yesterday, we woke up to snow on the roof and ground and it was still snowing. By the afternoon, the sun came out and all the snow melted, so it really was a Good Friday! 
Cheers!