So, I rebooted my MythTV into Windows Friday morning. The system asked me if I wanted to setup the drivers for the new Rosewill SATA card I was using to access the 500GB video server drive. This seemed reasonable enough.
Somehow, Windows managed to severely damage the ext3 partition on the drive over the course of setting up the driver. Lost everything that was on it, much with no backup.
So reformat. Reboot into Windows to see if it would be gentler now that the drivers are setup. Yes. Start over again.
While I was at it, install the ext2fs modules for Windows. For the 30 seconds I was testing it, seemed to work fine showing my Linux partitions on the Windows desktop.