Data storage device with composite spacer for disk stack assembly

A method of fabricating a data storage device, comprising:

• providing a hub;
• providing a first recording disk comprising a glass material and a center hole on the hub such that the hub extends through the center hole of the first recording disk;
• providing a first spacer on the first recording disk, the first spacer comprising a nickel-iron alloy;
• providing a second recording disk comprising a glass material and a center hole on the first spacer such that the hub extends through the center hole of the second recording disk;
• providing a second spacer on the second recording disk, the second spacer comprising a nickel-iron alloy;
• providing a third recording disk comprising a glass material and a center hole on the second spacer such that the hub extends through the center hole of the third recording disk,
• wherein the first recording disk, the second recording disk, and the third recording disk, each comprise a magnetic recording layer configured to store information.

A data storage device, comprising:

• a hub;
• a plurality of stacked recording disks, each recording disk comprising:
• a substrate comprising a glass material and a center hole, and
• a magnetic recording layer configured to store information,
• wherein the plurality of stacked recording disks comprise at least three recording disks positioned on the hub via respective center holes;
• and
• at least one means for providing spacing between each pair of adjacent recording disks of the at least three stacked recording disks, with each of the means for providing spacing comprising a nickel-iron alloy.

A data storage device, comprising:

• a hub;
• a plurality of stacked recording disks, each recording disk comprising:
• a substrate comprising a glass material and a center hole;
• and
• a magnetic recording layer configured to store information,
• wherein the plurality of stacked recording disks comprise at least three stacked recording disks positioned on the hub via respective center holes;
• and
• a plurality of spacers with at least one of the spacers disposed between each pair of adjacent recording disks of the at least three stacked recording disks, each spacer comprising a nickel-iron alloy.

A data storage device, comprising:

• a hub;
• a first recording disk comprising a glass material and a center hole on the hub such that the hub extends through the center hole of the first recording disk;
• a spacer on the first recording disk, the spacer comprising two layers of a nickel-iron alloy separated by a layer of a composite polymer;
• and
• a second recording disk comprising a glass material and a center hole on the spacer such that the hub extends through the center hole of the second recording disk,
• wherein the first recording disk and the second recording disk each comprise a magnetic recording layer configured to store information.