Magnetic recording device
First Claim
1. An abnormality detection method of a magnetic recording device, for detecting an abnormality of a data write to a magnetic recording medium by monitoring a write current supplied to a magnetic head, comprising the steps of:
- performing a write operation in a data area of the magnetic recording medium by supplying a predetermined write current to said magnetic head;
performing a rewrite operation by supplying a rewrite current having a value different from that of the predetermined write current to said magnetic head when an abnormality is detected in the write operation with the predetermined write current; and
judging a data write abnormality when an abnormality is detected in the rewrite operation with the rewrite current.
3 Assignments
0 Petitions
Accused Products
Abstract
A write operation to a magnetic recording medium (10) is performed by supplying a predetermined write current to a write head (1) from an R/W signal processing portion (2) through a head composite signal processing portion (3), and a rewrite operation is performed by supplying a rewrite current having a value different from that of the predetermined write current to the magnetic head (1) by supplying a write current having a value different from the predetermined write current under a control of a hard disk controller (6) when an abnormality is detected by a head abnormality detection circuit (5) in the write operation with the predetermined write current. When an abnormality is further detected by the head abnormality detection circuit (5), the data write is judged as abnormal.
6 Citations
10 Claims
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1. An abnormality detection method of a magnetic recording device, for detecting an abnormality of a data write to a magnetic recording medium by monitoring a write current supplied to a magnetic head, comprising the steps of:
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performing a write operation in a data area of the magnetic recording medium by supplying a predetermined write current to said magnetic head; performing a rewrite operation by supplying a rewrite current having a value different from that of the predetermined write current to said magnetic head when an abnormality is detected in the write operation with the predetermined write current; and judging a data write abnormality when an abnormality is detected in the rewrite operation with the rewrite current.
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2. An abnormality detection method of a magnetic recording device, for detecting an abnormality of a data write to a magnetic recording medium by monitoring a write current supplied to a magnetic head, comprising the steps of:
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performing a write operation in a data area of the magnetic recording medium by supplying a predetermined write current to said magnetic head; performing a rewrite operation by supplying a rewrite current having a value different from that of the predetermined write current to said magnetic head when an abnormality is detected in the write operation with the predetermined write current; and judging a data write abnormality when an abnormality is detected in the rewrite operation with the rewrite current, wherein the rewrite operation is performed in an area of the magnetic recording medium outside the data area thereof when the abnormality is detected during the write operation with the predetermined write current.
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3. An abnormality detection method of a magnetic recording device, for detecting an abnormality of a data write to a magnetic recording medium by monitoring a write current supplied to a magnetic head, comprising the steps of:
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performing a write operation in a data area of the magnetic recording medium by supplying a predetermined write current to said magnetic head; performing a rewrite operation by supplying a rewrite current having a value different from that of the predetermined write current to said magnetic head when an abnormality is detected in the write operation with the predetermined write current; and judging a data write abnormality when an abnormality is detected in the rewrite operation with the rewrite current, wherein the rewrite operation is performed twice with rewrite currents larger and smaller than the predetermined write current, respectively, when the abnormality is detected in the write operation with the predetermined write current.
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4. A magnetic disk device comprising:
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a magnetic head for writing data in a magnetic recording medium; write processor means for supplying a write current corresponding to data to be written in said magnetic recording medium; abnormality detection means for detecting an abnormality of write current supplied from said write processor means to said magnetic head; and control means for controlling said write processor means in response to an output signal of said abnormality detection means, wherein said control means comprises rewrite control means for performing a rewrite operation by supplying a write current having a value different from that of a predetermined write current to said magnetic head when said abnormality detection means detects an abnormality while said write processor means is supplying the predetermined write current to said magnetic head, and write continuation control means for continuing a write operation during which the abnormality is detected when said abnormality detection means detects no abnormality when said abnormality means detects no adnormality while said rewrite control means is supplying the write current having a value different from said predetermined write current. - View Dependent Claims (5, 6, 7)
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8. A method for verifying a magnetic head abnormality during a data write operation, comprising the steps of:
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performing a first data write operation with a magnetic head writing data to a recording medium with a first write current; detecting an abnormality in said write operation; performing a second data write operation with a second write current different from said first write current; checking whether an abnormality exists with said second data write operation and if so, performing a third data write operation with a third write current different from said first write current and said second write current; and checking whether an abnormality exists with said third data write operation and, if so, halting further write operations. - View Dependent Claims (9, 10)
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Specification