Talk:Servowriter

Is it really "spin" or magnetic flux polarity?
The head needs to fly on the electromagnetic surface of the disk to place the spin up or down. As far as I know, at least for floppy disks and earlier hard drives, the storage is still classically magnetic, i.e. the information is encoded using flux polarity inversions. Spin would be a quantum effect. Is that really what is used in a hard disk?