Disk hub for retaining and rotating magnetic recording media during film thickness measurement

A method of manufacturing a disk hub for retaining a magnetic recording medium comprising an annulus shape and a layer configured for magnetic recording, the method comprising:

• forming the disk hub using a thermoplastic polymer, comprising,
• providing a base plate portion configured to support an inner diameter area of the magnetic recording medium;
• and
• providing a stem portion on the base plate portion and configured to extend into a circular opening of the magnetic recording medium,
• the stem portion comprising a first section with a frustoconical shape and a second section extending between the first section and the base plate portion, wherein a circumference of the second section increases in a direction away from the base plate portion, and wherein a circumference of the first section decreases in the direction away from the base plate portion.

A disk hub for retaining a magnetic recording medium comprising an annulus shape and a layer configured for magnetic recording, the disk hub comprising:

• a base plate portion for supporting an inner diameter area of the magnetic recording medium;
• and
• a stem portion on the base plate portion and configured to extend into a circular opening of the magnetic recording medium,
• wherein the disk hub comprises an electrostatic dissipative material.