Comment by Someone

The original Mac floppy also was constant linear velocity (https://en.wikipedia.org/wiki/Constant_linear_velocity), with rotation speed being under software control.

http://www.mac.linux-m68k.org/devel/plushw.php:

“The Macintosh disk interface uses a design similar to that used on the Apple II and Apple III computers, employing the Apple custom IWM chip. Another custom chip called the Analog Signal Generator (ASG) reads the disk speed buffer in RAM and generates voltages that control the disk speed. Together with the VIA, the IWM and the ASG generate all the signals necessary to read, write, format, and eject the 3 1/2-inch disks used by the Macintosh.”