System, method and apparatus for shingled magnetic recording in disk drives
AssigneeHGST Netherlands B.V.
InventorsKosuke Saito, Kazuaki Usui, Masaharu Kawamura
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Abstract
A method of targeted corruption of user data in a shingled magnetic recording disk includes identifying user data on a Track_N targeted for corruption; identifying a readback centerline of the Track_N; identifying a readback centerline of an adjacent track to Track_N; acquiring user data of the adjacent track; and rewriting the user data of the adjacent track with an offset write centerline to overwrite magnetic material at the readback centerlines of both Track_N and the adjacent track.
Claims17
A method of targeted corruption of user data in a shingled magnetic recording disk, comprising:
- a. identifying user data on a Track_N targeted for corruption;
- b. identifying a readback centerline of the Track_N;
- c. identifying a readback centerline of an adjacent track to Track_N;
- d. acquiring user data of the adjacent track;
- and
- e. rewriting the user data of the adjacent track with an offset write centerline to overwrite magnetic material at the readback centerlines of both Track_N and the adjacent track.
A method of targeted corruption of user data in a shingled magnetic recording disk, comprising:
- a. identifying user data on a Track_N targeted for corruption;
- b. identifying a readback centerline of the Track_N;
- c. identifying readback centerlines of first and second adjacent tracks to Track_N;
- d. acquiring user data of the first and second adjacent tracks;
- e. rewriting the user data of the first adjacent track;
- and
- f. rewriting the user data of the second adjacent track on free space, corrupting magnetic material at the readback centerline of Track_N and rewriting the user data of both the first adjacent track at the readback centerline of Track N, and rewriting the user data of the second adjacent track at a new data track.
A method of targeted corruption of user data in a shingled magnetic recording disk, comprising:
- a. identifying a readback centerline for a Track_N;
- b. identifying a readback centerline of an adjacent track to Track_N;
- and
- c. writing dummy data on the adjacent track with an offset write centerline to overwrite magnetic material at the readback centerlines of both Track_N and the adjacent track, and rewriting user data of the adjacent track on free space.
Dependencies are inferred from the claim text.