ABSTRACT
The Media Servo track writing (STW) creates the servo pattern on the disks prior to the assembly of the hard disk drive (HDD). The STW process plays an important role in making the continuously growing trend of track density a reality. There are several mechanisms used to provide the reference while STW is performed. The Media STW creates the servo pattern on the disks prior to the assembly of the HDD. The HDD servomechanism generates position feedback using the servo patterns as reference, which is written on the disks when no reference is present on the disks or inside the HDD. Multidisk servo writing uses a dedicated STW to write servo patterns on a stack of disks. The HDD and the external positioner should be securely and rigidly clamped in a nest or tray, typically made of marble, to minimize the vibrations between them.
