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US 8,559,122 B2Granted
Integrated spiral certification head for media magnetic testing including PMR and LMR media
AssigneeHGST Netherlands B.V.
InventorWesley LeRoy Hillman
Life of this patent
Estimating the term…
Abstract
Testing procedure (Integrated Head Spiral Testing) for disk media utilizes a single head with both write and read elements that are offset to allow spiral testing. The offset allows a write element to write one portion of a spiral track while a read element simultaneously reads a previously written portion of the spiral track.
Claims19
A system for testing media including:
- a spin stand;
- a head including a read element and a write element offset by an offset amount, wherein the system is designed to use the head to concurrently:
- write a spiral data track to a disk;
- and
- read a portion of the spiral data track that was written to the disk one or more revolutions prior to a portion of the spiral data track currently being written to produce a readback signal;
- and
- logic adapted for determining when the readback signal shows a suspected defect,
- wherein the offset is in a cross track direction relative to the spiral data track, and
- wherein the offset amount equals a distance, or integer multiple of the distance, that the head moves per one revolution of the spin stand.
6 more elements
A method for determining the existence of a disk defect including the steps of:
- loading a first disk on a tester;
- positioning a head over a starting point of the first disk;
- enabling a write function of the head concurrently with enabling a read function of the head;
- moving the head positioner laterally at a constant rate to write data on a spiral data track;
- reading a previously written portion of the spiral data track that was written to the first disk one or more revolutions prior to a portion of the spiral data track currently being written to produce a readback;
- and comparing the read previously written portion of the spiral data track and corresponding written data on the spiral data track to determine if there is a defect on the first disk;
- wherein the head includes an offset read element and write element, the offset being in a cross track direction relative to the spiral data track, and wherein an amount of the offset equals a distance, or integer multiple of the distance, that the head moves per one revolution of the tester.
4 more elements
A system for testing media including:
- a spin stand;
- and a first head and a second head attached to the spin stand, the first head and the second head both include a read element and a write element offset by an offset amount, the offset being in a cross track direction relative to the spiral data track, wherein an amount of the offset equals a distance, or integer multiple of the distance, that the head moves per one revolution of the tester;
- and wherein the system is designed to use both the first head and the second head to write a spiral data track to a disk and read a previously written portion of the spiral data track not on the current revolution of the spiral data track from the disk to produce a readback signal for use in determining if there is a defect in the disk.
Dependencies are inferred from the claim text.