Actually, there were also hard disk drives. The drive was the motor attached to a spindle which would spin the disk whether the disk was floppy or hard. Your point still holds that spinning media are starting to be replaced by solid state devices. I agree that Google made a poor choice with the name. BTW the word drive goes back further than motors. It was and still is the term to cause sheep and draught animals to move where you wanted them to go. Still not great for Google's product.