There were external CD burners in the 90s, but burning a CD, even at 1x speed is way beyond the capabilities of an LC.

The first CD burner I came across cost megadollars and burned at 1x speed. It had quite an exotic suspension system to prevent vibration affecting the operation of the burner. The burner was connected to a PowerMac 7100. To burn a disk reliably, the 7100 had to be started with the bare minimum of extensions loaded and the network unplugged. Failure to do this would result in a failed burn and a $50 disk turned in to a coaster.

CD burners with inbuilt buffers and much faster computers have made this sort of trouble history.