Method and apparatus detecting base line popping noise in a read head and stablizing the magnetic domain of merged magnetoresistive read-write heads using DC write current and read bias current for an assembled disk drive
AssigneeSamsung Electronics Co., Ltd.
InventorsJong Yun Yun, Jae June Kim, Chin Won Cho, Chang Dong Yeo
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Abstract
The invention includes methods determining the presence of base line popping noise for a read head inside an assembled disk drive, as well as, determining read bias conditions for operating the read head free of base line popping noise. The invention further includes performance evaluation of the read head for read bias conditions free of base line popping noise. The invention also includes repairing the read head using DC write current and read bias current within the assembled disk drive.
Claims28
A disk drive determining the presence of base line popping noise received by a read head operating at a read bias setting and accessing a rotating disk surface contained in said disk drive, comprising:
- means for setting at least one threshold of a thermal asperity detector to a small threshold providing a thermal asperity event indication;
- wherein said read head is communicatively coupled with said thermal asperity detector;
- means for setting a read bias condition for said read head to said read bias setting;
- and
- means for counting said thermal asperity event indications when reading a zeroed track by said read head to determine said base line popping noise presence for said read head accessing said rotating disk surface at said read bias setting.
The apparatus of claim 13,
- wherein said write current level is approximately at least 50 mA DC.
A method determining the presence of base line popping noise received by a read head operating at a read bias setting and accessing a rotating disk surface of a disk drive containing said rotating disk surface and said read head, comprising the steps of:
- setting at least one threshold of a thermal asperity detector to a small threshold providing a thermal asperity event indication;
- wherein said read head is communicatively coupled with said thermal asperity detector;
- setting a read bias condition for said read head to said read bias setting;
- and
- counting said thermal asperity event indications when reading a zeroed track by said read head to determine said base line popping noise presence for said read head accessing said rotating disk surface at said read bias setting.
The method of claim 27,
- wherein said write current level is approximately at least 50 mA DC.
Dependencies are inferred from the claim text.