TH19932B - Magnetic disk files that are in contact with a magnetic resistance read recognition device? - Google Patents

Abstract

The magnetic contact solid recording disk file uses a magnetic resistive (MR) sensor for reading the data recorded on the disk. The disk file may be the liquid bearing type of the contact recording with the MR sensor supported on the follow tip. of carriers riding on fluid bearings. Plate file performance is enhanced by combining paths for minimizing the effect of wave modulation. The wave modulation was determined to be caused by the variability of the temperature-sensitive MR sensor and the temperature-raising plate by the plate, where the temperature variation was directly related to the variation in the head-plate distance caused by the MR. The ripple of the pilter disk surface may be integrated with the disk file read signal processing circuit to eliminate wave mixing. The lowest signal and the carrier part in contact with the disc surface may be chosen to have a length less than the undulating period of the disc so that it follows more closely than the topography of the disc surface.

Claims (31)

1. A data storage file consists of: a rigid magnetic disk for data storage; a path connected to the disk for rotating it; a magnetic resistive head to generate a response signal to the magnetically recorded data on the disk; the magnetic resistive head's temperature is higher than the disk's temperature; a carrier that supports the magnetic resistive head and is in contact with the disk during data reading by the magnetic resistive head; the temperature of the magnetic resistive head and its electrical resistance vary in response to the variation in the gap between the magnetic resistive head and the disk, which is lower as the disk rotates against the contacting carrier; a path to process the signal from the magnetic resistive head; the signal received by the processing path is baseline modulated as a result of the aforementioned variation in the electrical resistance of the magnetic resistive head; a path to minimize this baseline modulation; and a path connected to the carrier to move the carrier and the supported magnetic resistive head across the disk. 2. A disk file pursuant to claim paragraph 1, where the disk is incorporated with a liquid film on its surface to provide a liquid bearing, and where the carrier is incorporated with a pathway to support the carrier on the liquid bearing. 3. A disk file pursuant to claim clause 2, with a carrier including skis for movement on a film of liquid. 4. A disk file pursuant to claim clause 2, whereby the carrier includes a number of cushions for plowing through a film of liquid. 5. Disk recording file pursuant to claim clause 1, where the carrier includes a wear-resistant surface to prevent erosion during contact with the disk. 6. A disk file pursuant to claim clause 5, whereby the disk is incorporated with a lubricant on its surface for contact by the wear-resistant surface of the carrier. 7. The disk file pursuant to claim clause 1, which includes, in addition to, a means of maintaining the carrier in contact with the disk, and where the carrier and the means of maintaining the carrier in contact are constructed as a head-mounted device, the head-mounted device having a wear-resistant surface in contact with the disk. 8. A disk file pursuant to claim clause 7, whereby the disk is coated with lubricant on its surface for contact by its wear-resistant surface of the integrated head hanger. 9. The disk file pursuant to claim clause 1, where the path to minimize baseline modulation also includes a path for filtering the baseline modulation signal generated by the magnetic resistor. 10. The disk file pursuant to claim 1, where the path to minimize baseline modulation also includes a path to maintain the temperature of the magnetic resistance head below a predetermined value. 11. The disk file pursuant to claim clause 1, whereby the method for minimizing baseline modulation is comprised of such magnetic resistor heads of a predetermined height such that the ratio of the baseline modulation signal to the amplitude of the magnetic signal realized by the magnetic resistor head is approximately less than 0.2. 12. The disk file pursuant to claim clause 1, whereby the path for minimizing baseline modulation includes a path to supply a pia current to the magnetic resistor head such that the ratio of the baseline modulation signal to the amplitude of the magnetic signal perceived by the magnetic resistor head is approximately less than 0.2. 13. The disk file pursuant to claim clause 1, whereby the path for minimizing baseline modulation results in the baseline modulation signal generated by the magnetic resistor head being less than twenty percent of the amplitude of the magnetic signal realized by the magnetic resistor head. 14. A disk file pursuant to claim clause 1, which includes an inductive write head connected to a carrier for writing data to the disk. 15. The magnetic disk drive unit comprises a rigid magnetic disk with a wavy surface, a motor connected to the disk for rotation, a resistive magnetic read sensor to detect magnetically recorded data from the disk and generate a signal; the read sensor is heated by an electric current. A carrier supports the read sensor and is in contact with the disk during data sensing. The gap between the read sensor and the disk surface varies as the disk rotates due to the waviness of the disk surface. An excitation driver is connected to the carrier to move the carrier, typically radially across the disk, allowing the read sensor to access different data regions on the disk. A path is connected to the read sensor to process the signal from the read sensor. The signal from the read sensor is combined with baseline modulation induced by varying the gap between the heated read sensor and the disk surface. A path is provided to reduce this induced baseline modulation, and a path is provided to support the motor and excitation driver. 16. The drive unit of the record plate according to claim 15, where the plate is incorporated with a liquid film on its surface to provide a liquid bearing and where the carrier is incorporated with a pathway to support the carrier on the liquid bearing. 17. A disk drive unit pursuant to claim paragraph 16, with a carrier including skis for movement over a liquid film. 18. A disc drive unit pursuant to claim paragraph 16, whereby a carrier including a number of cushions is used for plowing over a film of liquid. 19. The disc drive unit, as per claim 15, shall include a carrier with a wear-resistant surface to minimize wear during contact with the disc. 20. Disc drive unit as per claim 19, where the disc is included with lubricant for contact with the wear-resistant surface of the carrier. 21. The disc drive unit pursuant to claim clause 19, where the carrier is a head-mounted suspension device, the head-mounted suspension device has a wear-resistant surface for contact with the disc, and the head-mounted suspension device is integrated with a suspension device to maintain a general wear-resistant surface in contact with the disc. 22. Disc drive unit as per claim 21, where the disc is lubricated to make contact with the wear-resistant surface of the integrated head hanger. 23. The disk drive unit pursuant to claim clause 15, whereby the baseline modulation reduction path also includes a path for filtering the baseline modulation signal generated by the magnetic resistive read head. 24. The disk drive unit pursuant to claim clause 15, whereby a mechanism to reduce baseline modulation is incorporated, and a mechanism to maintain the temperature of the heated magnetic resistive read sensor below a predetermined value. 25. The disk drive unit pursuant to claim paragraph 15, whereby a means to reduce baseline modulation is incorporated with such a magnetic resistive read sensor of a predetermined height such that the ratio of the baseline modulation signal perceived by the magnetic resistive read sensor to the amplitude of the magnetic signal perceived by the magnetic resistive read sensor is approximately less than 0.2. 26. The disk drive unit, in accordance with claim No. 15, whereby a means to reduce baseline modulation is incorporated into the space of the magnetic resistance sensor, the thermal conductivity of which is predetermined to be sufficient to cool the magnetic resistance sensor to a quantity such that the ratio of the baseline modulation signal perceived by the magnetic resistance sensor to the amplitude of the magnetic signal perceived by the magnetic resistance sensor is approximately less than 0.2. 27. The disk drive unit pursuant to claim clause 15, whereby the method to reduce baseline modulation includes a method for supplying a bias current to the magnetic field sensor such that the ratio of the baseline modulation signal to the amplitude of the magnetic field signal perceived by the magnetic field sensor is approximately less than 0.2. 28. A disk drive unit pursuant to claim No. 15 whereby a path to reduce baseline modulation reduces the baseline modulation signal to less than twenty percent of the amplitude of the magnetic signal perceived by the resistive read sensor. 29. A disk drive unit as per claim 15, which includes an inductive write head connected to a carrier for writing data to the disk. 30. The data storage file consists of: a rigid magnetic disk for data storage, a disk with a wavy surface; a path connected to the disk for rotation; a magnetic resistive head to generate a response signal to the magnetically recorded data on the disk; the magnetic resistive head has a temperature higher than the disk temperature; a carrier that supports the magnetic resistive head and is in contact with the disk during data reading by the magnetic resistive head; the portion of the carrier in contact with the disk has a length less than the period of the wavy surface of the disk to minimize the gap variation between the magnetic resistive head and the lower-temperature disk surface as the disk rotates; where the variation in temperature and simultaneously the electrical resistance of the magnetic resistive head are minimized; a path to process the signal from the magnetic resistive head; the signal received by the processing path has a baseline modulation signal; due to the aforementioned electrical resistance variation, less than twenty percent of the amplitude of the magnetic signal perceived by the magnetic resistive head is a result of the gap variation being minimized by the length of the portion of the carrier in contact with the disk; and a path connected to the carrier to move the supported magnetic resistive head carrier across the disk. 31. The magnetic disk drive unit comprises a rigid magnetic disk with a wavy surface, a motor connected to the disk for rotation, a magnetic resistive read sensor to detect magnetically recorded data from the disk, the read sensor is heated by an electric current, a carrier supporting the read sensor and in contact with the disk during data detection, the portion of the carrier in contact with the disk having a length less than the period of the wavy surface of the disk, where the variation in the gap between the heated read sensor and the disk surface as the disk rotates is minimized, an excitation driver connected to the carrier to move the carrier, typically radially across the disk so that the read sensor may access different regions of data on the disk, a path connected to the read sensor to process the signal from the read sensor, the signal from the read sensor is baseline modulated by minimizing the variation in the gap between the heated read sensor and the disk surface as a result of which this gap variation is minimized by the length of the portion of the carrier in contact with the disk and the path to support the motor and excitation driver.