Printed Media technology for an effective and inexpensive servo track writing of HDDs

Abstract

As an alternative method for the servo track writing of hard disk drives (HDDs), a magnetic contact duplication method by using a lithographically patterned master disk has been proposed and investigated. On the master disk, magnetic film pattern according to the information signal to be printed on slave disks is provided by a lithography technique. In this method, unlike the anhysteretic process of tile conventional contact duplication method for magnetic tapes, the master inlormation never disappears when a large external field is applied to the master while printing. This duplication method, as we call the Printed Media technology, can provide a very effective and inexpensive lump-sum servo track writing method ror HDDs.

Nanofabricated and self-assembled magnetic structures as data storage media

“…A more recent approach to patterning servo information and mass replication of content onto magnetic disk media is the use of magnetic lithography [9,[182][183][184][185][186]. In this process, a magnetic pattern on one substrate, the master or mask, is transferred using an applied magnetic field to a magnetic film on a second substrate, sometimes referred to as a slave.…”

Performance and Potential of High-Density Bit Recording Using Patterned Master Contact Duplication

“…A new type of magnetic duplication, called patterned master contact duplication, was proposed in 2000 [1,2] . Since the master does not need higher coercivity Hc , than that of the slave, it is possible to duplicate even to highrecording-density hard disks with high Hc This duplication is expected to resolve the problems of conventional servo-track writing (STW), such as STW time, writing cost, and precise writing [3,4]. Although many studies of the method have been conducted, most of them have involved micron-sized bits [5][6][7].…”