"Disc Too Slow?" What does that mean?

Recording live horns (blue tracks). Five tracks. Via PreSonus Firebox preamp.
Got a pop-up window: "Disc Too Slow." In the track editor of one track, a solid block of black, taking up about half a measure.
Never seen anything like this before. What does this mean?

I'm recording on my iMac computer. So I presume that's an internal disc.
The tune has five tracks: all real tracks (blue). Recording one track at a time. Coming in via Shure mic into Presonus Firebox preamp. Firewire cable.
Don't know what the speed is. That's one thing I've never even thought of before. Seems that G/Bs settings were everything I needed.
This is a new one to me.

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