High density magnetic storage disc comprising a spiral of magnetic tape

Claim 2

A magnetic data storage disc, comprising a cylindrical base member having a substantially flat bottom surface and a flexible plastic wall means joined to and projecting from the top surface thereof and arranged in a spiral coaxial with the cylindrical base member, adjacent convolutions of the spiral wall means having a normal position in which they are spaced from and out of contact with one another, at least one side of the wall means carrying an exposed coating of magnetic recording material for magnetically recording therein at least one track of information, said wall means being sufficiently flexible and resilient to be deflected from said normal position upon application of a deflecting force thereto and to return to said normal position upon removal of said force.

Claim 3

The magnetic data storage disc according to claim 1, wherein both sides of the plastic wall means carry a coating of said magnetic recording material.

Claim 4

The magnetic data storage disc according to claim 1, wherein said base member has a bore through the center thereof, the spiral wall means extending from the circumference of the top surface to the central bore.

Claim 5

The magnetic data storage disc according to claim 1, wherein said wall means is from about 1/8 inch to about 1/4 inch high.

Claim 6

A magnetic data storage disc, comprising first and second coils of flexible plastic tape laminated together in coaxial spirals with the convolutions of one tape coil alternating in side-by-side relationship with the convolutions of the other, a first portion of the convolutions of one tape coil being in contact with and joined to the adjacent convolutions of the other tape coil along the entire length of the coils and the remaining portion thereof having a normal position in which it is out of contact with convolutions of both tape coils, said remaining portion of said first tape carrying an exposed coating of magnetic recording material for magnetically recording therein at least one track of information, said first tape being sufficiently flexible and resilient to enable said remaining portion to be deflected from said normal position upon application of a force thereto and to return to said normal position upon removal of said force.

Claim 7

A magnetic data storage disc, comprising first and second coils of flexible plastic tape laminated together in coaxial spirals with the convolutions of one tape coil alternating in side-by-side relationship with the convolutions of the other, a first portion of the convolutions of one tape coil being in contact with and joined to the adjacent convolutions of the other tape coil along the entire length of the coils and the remaining portion thereof having a normal position in which it is out of contact with convolutions of both tape coils, said remaining portion of said first tape carrying an exposed coating of magnetic recording material for magnetically recording therein at least one track of information, said first tape being sufficiently flexible and resilient to enable said remaining portion to be deflected from said normal position upon application of a force thereto and to return to said normal position upon removal of said force.

Claim 8

The magnetic data storage disc according to claim 5, wherein said remaining portion is from about 1/8 inch to about 1/4 inch wide.

Claim 9

The magnetic data storage disc according to claim 6, wherein both sides of said remaining portion of the first tape carry said exposed coating of magnetic recording material.