| 摘要 |
A sensing mechanism for reading a magnetic storage medium includes first and second variable resistive elements, and sensing elements. Each first and second variable resistive element has a variable resistance. Each sensing element has a resistance depending at least on a portion of the medium currently being read. First and second ends of each sensing element are electrically connected to corresponding first and second variable resistive elements, respectively. For each sensing element, the resistance value of the first variable resistive element to which it is electrically connected is equal to the resistance of the second variable resistive element to which it is electrically connected, so that a mid-point voltage at each sensing element is equal. For each sensing element, the variable resistances of the first and second variable resistive elements to which it is electrically connected are selected so that the desired current flows through the sensing element.
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