Magnetic recording and reproducing device
AssigneeFujitsu Limited
InventorsNobuyoshi Yamasaki, Yuichiro Yamazaki
Life of this patent
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Abstract
A magnetic recording and reproducing device comprising a magnetic head for writing data to a storage medium by write current, and a computing unit that has a program area for determining a value indicating a signal quality of data read from the recording medium, and a memory area for holding a first write current value which is a predetermined optimum value and a second write current value which is lower than the first write current value.
Claims16
A magnetic recording and reproducing device, comprising:
- a magnetic head which writes data to a storage medium based on write current;
- and
- a computing unit which has a program area for determining a value indicating a signal quality of data read from the recording medium, and a memory area for holding a first write current value which is a predetermined optimum value and a second write current value which is lower than the first write current value, wherein
- the magnetic head writes data to the recording medium based on the first and second write current values which are set by the computing unit, and reads the data written in the recording medium, and
- the computing unit sets the first and second write current values for the write current to be supplied via the magnetic head, determines values indicating first and second signal qualities corresponding to the data that is read by the magnetic head respectively, compares the value indicating the first signal quality with the value indicating the second signal quality, and judges that the magnetic head has no problem if the value indicating the first signal quality is lower than the value indicating the second signal quality.
A defective head detection method in a magnetic recording and reproducing device having a magnetic head for writing data to a storage medium based on write current, and a computing unit that has a program area for determining a value indicating a signal quality of data read from the recording medium and a memory area for holding a first write current value which is a predetermined optimum value and a second write current value which is lower than the first write current value, comprising the steps of:
- a first step of setting the first write current value for the write current to be supplied via the magnetic head, writing data to the recording medium, reading the data written in the recording medium, and determining a value indicating a first signal quality of the read data;
- a second step of setting the second write current value for the write current to be supplied via the magnetic head, writing data to the recording medium, reading the data written in the recording medium, and determining a value indicating a second signal quality of the read data;
- a comparison step of comparing the value indicating the first signal quality with the value indicating the second signal quality;
- and
- a judgment step of judging that the magnetic head has no problem if the value indicating the first signal quality is lower than the value indicating the second signal quality.
Dependencies are inferred from the claim text.