US 9,311,941 B1 · Erase coarse guide spiral-based in-drive erase process

Abstract

In an in-drive erase process for erasing disk surfaces of a hard disk drive, erase spirals are written on multiple disk surfaces and at a different write frequency than that of other data patterns on the disk surfaces. The erase spirals written on a first disk surface can be used to control an erase process on a portion of the remaining disk surfaces. Erase spirals are then written on a different disk surface and can then be used to erase all data on the first disk surface. Consequently, even when every disk surface includes previously written data patterns that can potentially interfere with control of the erase process, the erase spirals so written can control the erase process with sufficient precision to thoroughly erase each disk surface.

Claims20

Dependent claims

A data storage device comprising:

first and second data recording surfaces;
first and second write heads respectively associated with the first and second data recording surfaces;
a controller configured to:
control the first write head to write a first spiral track on the first data recording surface;
control the second write head, based on the first spiral track, to write an erase pattern on the second data recording surface;
control the second write head to write a second spiral track on the second data recording surface;
and
control the first write head, based on the second spiral track, to write an erase pattern on the first data recording surface.

5 more elements

Dependencies are inferred from the claim text.

Erase coarse guide spiral-based in-drive erase process

Life of this patent

Erase coarse guide spiral-based in-drive erase process

Life of this patent

Abstract

Claims20