History (1988): Maxell 5.25-Inch Perpendicular Magnetic FD

Perpendicular magnetic recording is a method where the recording medium is magnetized vertically. The features of this method are that it increases recording density, and at the same time makes recording magnetization more stable.

It is thus a technique which is suited to high-density recording. Hitachi Maxell Ltd. (Japan) pretends, through a design which is vertically magnetized, to be able to manufacture a vertically magnetized recording medium which is 2μ thick. With its elasticity, contact with the recording head is good, and when combined with the new amorphous alloy-ferrite composite heads, this medium offers superior recording qualities, according to Maxwell.

Main specs:

• Magnetic layer thickness: 2μ
• Recording density: 100Kbpi
• Dso: more than 140Kfci
• Coercivity: 800Oe

This article is an abstract of news published on the former paper version of Computer Data Storage Newsletter on issue ≠1, volume ≠1, published on February 1988.