sunder25 said:
If the drives are detected separately, you should be able to change which drive data is cached to.
My computer properties>advanced system settings>advanced>performance>advanced>virtual memory Change select drive to use for cache.
Thanks -- that's not the answer, but it did point me in the right direction.
Actually, that wasn't an option in this case -- however, your answer did lead me to where I needed to go to disable the SSD drive: Computer > Properties > Hardware > Device Manager > Disk Drives. I disabled the SanDisk, crossed my fingers and rebooted -- and am no longer seeing warnings.
I think it's also possible the caching was simply not functioning after the factory reset, but I don't know how I'd have been able to tell.