Yes sir, Mr. Plush-phonic sir! I will most definitely be in touch with Korg on Monday to find out what's up.
In the meantime, just to second-guess myself I've rolled the firmware back to 1.50 and have optimized the drive. I have a small club show I can experiment with on Monday evening (the Korg will be a secondary or 3rd deck, so no worries), so I'm going to go ahead and give it a shot. I'm actually hoping for a disk error again, otherwise I'll be very worried.
Nothing worse than not being able to trust your recording device.