Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Reexamination Certificate
2006-04-04
2006-04-04
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
Reexamination Certificate
active
07023632
ABSTRACT:
Tools are provided to identify undesired pole tip protrusion (PTP) on a write portion of a read/write head in a hard disk. Such tools may be incorporated in the hard disk. A corrective action arrangement performs a corrective action in response to the identification of an undesired pole tip protrusion. The corrective action may comprise burnishing of pole tips of a write portion of the read/write head. An asperity read signal condition monitoring circuit monitors asperity conditions from the read signal. The asperity condition may be a high fly write condition, or it may be a thermal asperity condition. A PTP determining circuit determines when a monitored condition is indicative of an undesired PTP condition. A PTP test write cycle may be caused, during which the monitoring circuit monitors either during or right after the PTP test write cycle.
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Egan Curtis
Haddock Quinn
Maxtor Corporation
Myers Bigel & Sibley Sajovec, PA
Rodríguez Glenda P.
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