Ohara’s GD-FHT™ are finely polished glass disks used in the testing of magnetic recording heads for Hard Disk Drives. We supply two types of disks, Conventional and Lower Microwaviness (Wa). The Conventional disks are well suited for fly height testing above 0.2 u-inch, while the Lower Wa disks are targeting lower fly height values. GD-FHT™ disks have better electrical properties than conventional disks and will provide better ESD protection. These disks have excellent mechanical strength and can significantly improve your production yields.