For HDD Magnetic Disks
Magnetic disks made of aluminum alloys are used in hard disk drives (HDDs) because aluminum is non-magnetic, lightweight and grindable precisely. Aluminum substrates are less expensive than glass substrates, so they are used not only in personal computers but also in home electronics such as HDD recorders.
- Our optimum casting and heat treatment conditions limit intermetallic compounds and non-metallic inclusions which cause surface defects on magnetic disks.
- Excellent flatness necessary for magnetic disks is attained by our sophisticated manufacturing technology and quality control.
Chemical composition and characteristics of FP-3 alloy
Chemical composition (mass%)
|Specific gravity||Young's modulus
|Thermal expansion coefficient
Magnetic disk production process (abbreviated)