Multitrack servo marks with perpendicular and longitudinal magnetic fields

    公开(公告)号:US10332557B1

    公开(公告)日:2019-06-25

    申请号:US16130451

    申请日:2018-09-13

    摘要: A servo sector on a disk is read via first and second readers that both span two or more user data tracks. The servo sector has a crosstrack width that spans the two or more user data tracks. The first reader provides a first signal based on detecting a total longitudinal field of the servo sector. The second reader provides a second signal based on detecting a total perpendicular field of the servo sector. A position error of the first and second readers is detected using. A value of the first signal can be used to detect a position error, detect a track-to-track phase error, and/or detect a Gray code error of a track ID field of the servo sector.

    EMBEDDED DISCONNECTED CIRCUITS IN MAGNETIC STORAGE MEDIA OF DATA STORAGE DEVICES

    公开(公告)号:US20180373452A1

    公开(公告)日:2018-12-27

    申请号:US16018360

    申请日:2018-06-26

    摘要: Disclosed herein are magnetic storage media with embedded disconnected circuits, and magnetic storage systems comprising such media. A magnetic storage media comprises a recording layer comprising a storage location, and an embedded disconnected circuit (EDC) configured to assist in at least one of writing to or reading from the storage location in response to a wireless activation signal. A magnetic storage system comprises a signal generator configured to generate a wireless activation signal, a magnetic storage media with a plurality of storage locations, and a write transducer and/or a read receiver. The magnetic storage media has at least one EDC configured to assist in writing to and/or reading from at least one of the plurality of storage locations in response to the wireless activation signal.