..:: THE OPTICAL CORPORATION ::..

FLYING HEIGHT TEST DISKS

Flying Height Test (FHT) Disks have been supplied to the majority of the global computer and data storage industry for 15 years running by The Optical Corporation. Flying height test disks are used to measure the flight characteristics of magnetic heads in hard disk drives. TOC has developed a broad capability in fabricating flying height test disks including superb parallelism, ultra-low surface microroughness, and exemplary inner hole concentricity.

Super-polished surfaces for microroughnesses < 2 Å rms

Parallelism < 10 arc seconds

Outer diameters from 48 to 150 mm

Inner diameters from 5 to 13 mm

Concentricity to better than 5 µm

Surface flatness to

Substrate Materials

BK7

Fused Silica

Zerodur®

Pyrex®

Thickness range from 2.5 to 9.5 mm

Surface qualities better than 30-20

Rapid turnaround

Extremely cost competitive

Full production and custom fabrication and coating runs

The Optical Corporation will also refurbish damaged FHT disks to their original specifications even if they were not originally manufactured by TOC. We will refurbish disks made from BK7 and fused silica as well as other materials.