Ok, I figured it out. There's a Disk Defragmenter service that was disabled. Maybe done by the SSD's utility, but unnecessary, as the SSD wasn't (and I don't think can be) scheduled to run.
Why is it necessary that a freaking disk defragmenter needs to run as a service???? Defragmenting is done either manually or on a schedule, so why does a service need to run 24x7?