Technique for recording bias current glitches in magnetoresistive heads
AssigneeMaxtor Corporation
InventorsBac Pham, Xiaokun Chew
Life of this patent
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Abstract
Circuitry for detecting and recording latches in read bias current may include circuitry for generating a reference voltage, a pair of current to voltage converters to convert the bias and reference currents to voltage signals, a comparator to compare those two voltages, a latch to latch the compared signal, and a counter/register to count and store the number of glitches that have been detected. It may be possible to read from the register the number of detected glitches to be used in diagnosing faults in the disk drive system. In addition, it may be possible to provide a reset input to the register to zero the counter.
Claims36
A read/write head system that writes data to and reads data from an adjacent magnetic storage disk, comprising:
- a write transducer;
- a read transducer in close proximity to the write transducer;
- and
- a preamp circuit communicatively coupled to the read transducer, the preamp circuit supplying a bias current to the read transducer and the preamp circuit measuring a voltage developed across the read transducer by the bias current to determine the resistance thereof in order to determine the presence of a nearby magnetic signal stored in the adjacent disk;
- wherein the preamp circuit includes a storage device to store the number of times that the bias current has exceeded a predetermined magnitude.
A method for recording glitches in read bias current in a read/write head, comprising:
- providing a read/write head having a read transducer;
- supplying a bias current to the read transducer;
- measuring a voltage developed across the read transducer by the bias current to determine the resistance thereof in order to determine the presence of a nearby magnetic signal stored in the adjacent disk;
- and
- storing the number of times that the read bias current exceeds a predetermined magnitude.
A read/write head system that writes data to and reads data from an adjacent magnetic storage disk, comprising:
- a write transducer;
- a read transducer in close proximity to the write transducer;
- and
- a preamp circuit communicatively coupled to the read transducer, the preamp circuit supplying a bias current to the read transducer;
- wherein the preamp circuit includes a storage device to store the number of times that the bias current has passed a predetermined threshold.
A method for recording glitches in read bias current in a read/write head, comprising:
- providing a read/write head having a read transducer;
- supplying a bias current to the read transducer;
- measuring a voltage developed across the read transducer by the bias current to determine the resistance thereof in order to determine the presence of a nearby magnetic signal stored in the adjacent disk;
- and
- storing the number of times that the read bias current passes a predetermined threshold.
Dependencies are inferred from the claim text.