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US 2009/0213712 A1Published application
Method and System for Distinguishing Spatial and Thermal Defects on Perpendicular Media
AssigneeMra Tek, LLC
InventorsStephen Frank Meier, David H. Ferry, Hassan Jalalian
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Abstract
Disclosed are a method and system for distinguishing spatial and thermal defects on perpendicular media. The magnetic domains of the perpendicular media are oriented to have a first polarity, scanned using a read head, oriented to have a second polarity and scanned again. The signals from the read head are combined to produce output signals having improved signal to noise ratios from which the locations of spatial and thermal defects can be identified and distinguished.
Claims1
A method of distinguishing spatial and thermal defects on perpendicular media comprising the steps of:
- performing a first DC erase having a first polarity on the perpendicular media;
- scanning the perpendicular media to produce a first signal;
- performing a second DC erase having a second polarity on the perpendicular media;
- scanning the perpendicular media to produce a second signal;
- comparing the first and second signals;
- identifying locations on the perpendicular media having defects;
- and,
- distinguishing the defects.
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