Electricity: measuring and testing – Magnetic – Magnetic information storage element testing
Reexamination Certificate
2007-02-06
2007-02-06
Lefkowitz, Edward (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetic information storage element testing
Reexamination Certificate
active
11189594
ABSTRACT:
A magnetic test module runs on a spin stand to detect amplitude decay and noise evolution at the same time. Signal-to-noise ratio (SNR) decay is directly measured. The recording performance is correlated better with SNR instead of signal only. The thermal stability of the system is evaluated more accurately with this SNR decay method. A heater is placed under the media disk, and a remote sensing thermometer and temperature controller form a subsystem to set up desired environmental temperature. The heater creates a heated band and the read/write head flies above the heated band. The temperature control system may be removed when SNR decay measurement is performed under room temperature.
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Duan Shanlin
He Jizhong
Shi Zhupei
Zhang Jane Jie
Bracewell & Giuliani LLP
Hitachi Global Storage Technologies - Netherlands B.V.
Lefkowitz Edward
Schindler David M.
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