Information storage device having coated metal hub

The method of making an information storage disk which comprises:

• forming a hub-shaped substrate of a steel material having a first magnetization;
• depositing a coating of nickel base metal and phosphorous additive on the substrate, the coating having a nodular surface characteristic of an amorphous deposit;
• wherein the magnetization of the coating is less than said first magnetization, and wherein the surface of the deposit forms an oxide containing substantial phosphorous;
• and,
• bonding the substrate to the center of a disk of information storage medium.

The method of making an information storage disk comprising:

• forming a hub-shaped substrate of a steel material;
• depositing a coating comprised of amorphous non-magnetic nickel on the substrate;
• converting the coating to a magnetic material by heating the coated substrate;
• wherein the magnetization of the coating is less than the magnetization of the substrate;
• and,
• bonding the substrate to the center of a disk of information storage medium.

The method of preventing corrosion and attenuating wear on a metal hub of an information storage disk which has a magnetized drive spindle which comprises:

• forming a hub substrate having a first magnetization;
• and,
• coating the hub with a coating which has less magnetization than the first magnetization, the coating having a magnetization greater than about 4 Gauss;
• wherein any coating wear particulate are paramagnetic in sufficient degree to be attracted to the magnetized spindle.