I'd have to get back to you the makes of the SSDs, but they're well known brands. And yeah, I did play around with Logic's settings. I set the buffer to a variety of things, that bought me a little more play time, I set the threads to being 24 from being automatic, and I changed the summing bus to being 32 bit instead of 64 bit. None of that seemed to resolve.
When I look at the performance meter, you'll see the three processors working just fine, I'm assuming one for each track. The disk meter is around 5-10% and then all of a sudden it spikes to 100% and that's the end of it.
I'll test more this weekend... I'll miss Drummer, but last time I used Logic with just Drummer and one MIDI/VI track it still couldn't do anything.
Odd, though, because just a couple months ago I was working on a pretty big project and chugging along just fine. I think I took a Logic update, so maybe that did it, but the fresh install didn't resolve anything.
I'll try and get that project playing this weekend, so far I haven't been able to since I don't have all the VIs that were used on it loaded yet.
And those were some pretty heavy users, BFD 3, some others.
I'm not at all sure what the problem is. But it seems like the "disk too slow" thing has been an affliction that has affected all Logic users at some point or the other. I guess I've been lucky so far, but I can't get a clear handle on what the fix for that ever is, either.