Disc drive with improved storage capacity

Claim 1

A drive system for a floppy disc having numbered data tracks on both sides thereof, said data tracks being ordered in a predetermined sequence, said drive system comprising: a first head for transferring data between a personal computer or the like and one side of the floppy disc; a second head for transferring data between the personal computer and the second side of the floppy disc; a stepper motor responsive to stepper motor control signals for moving the first and second heads to predetermined tracks on the floppy disc, said stepper motor control signals determining the predetermined track to which the stepper motor moves the heads; a control circuit for generating the stepper motor control signals, said control circuit receiving signals from the computer in a predetermined standard format defining the action desired by the computer; the tracks on said floppy disc being disposed with the first "n" tracks on one side of the floppy disc and the "n+1"s track and remaining tracks on the other side of the floppy disc, said "n"th and "n+1"st tracks being disposed adjacent each other along a boundary of the disc but on opposite sides of the disc; said control circuit including means for generating a first predetermined sequence of stepper motor control signals when the computer requests movement from any one track to a higher track and for generating a second predetermined sequence of stepper motor control signals when the computer requests movement from any one track to a lower track; said control circuit further including transforming means responsive to a transition from the "n"th track to the "n+1"st track to accept the first predetermined sequence of stepper motor control signals and transform those signals into signals which cause movement of the stepper motor in the direction opposite that caused by the untransformed signals of the first predetermined sequence and to accept the second predetermined sequence of stepper motor control signals and transform those signals into signals which cause movement of the stepper motor in the direction opposite that caused by the untransformed signals of the second predetermined sequence.