JPS63281208A - Magnetic head for recording - Google Patents

Abstract

PURPOSE:To decrease the generation of a reading error by providing a second erasing gap to be able to erase the outside from a usual erasing scope besides a usual erasing gap. CONSTITUTION:A gap 2 for read/write and an erasing gap 3 are set to a gap width for 96TPI. A second erasing gap 4 to erase the outside from the usual erasing gap 3 erases the track adjacent to the track to read write processing with the gap 2 for the read write, and set to a gap width not to erase two adjacent tracks considering the positioning error of a head slider 1. Namely, when the writing action of 48TPI is executed with the head of 96TPI, the data of the odd number track of 96TPI can be erased by executing the erasing action due to the second erasing gap 4 at the time of writing. Thus, even when the written magnetic disk is read by the head for 48TPI, the reading error does not occur.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic recording head.

[Conventional technology]

Conventionally, this type of magnetic recording head (hereinafter simply referred to as a head) has a head read/write function for each set width of the recording track.
The width of the gear lubricant for writing and the width of the erase gap were manufactured to be constant.

[Problem that the invention seeks to solve]

In the conventional head described above, the read/write gap width and erase gap width are fixed, so for example, 96 TPI (tracks/inch) in a disk device.
If you try to record at 48TPI using a 96TPI head, the erase gap width will be small, resulting in unerased data between tracks.
If an attempt is made to read data written with a 48 TPI head, the unerased data will be superimposed on the normal data, resulting in a significant deterioration in the reliability of the data.

Figure 2(a) shows track 10 written on a magnetic disk at a high TPI, for example 96TPI, i.e. 96TPI.
FIG. 2(b) shows a part of the locus of the read/write gap of the I head on the magnetic disk.
Track numbers are shown below tracks 10 and 11 in FIGS. 2(a) and 2(b).

When trying to write 487PI using a conventional 96TPI head, the n track of 48TPI is 96
96T on the way to accommodate TPI's 2n) rack
Since the write operation is performed by skipping over odd-numbered tracks at PI, data at odd-numbered track positions at 96 TPI remains unerased.

When reading n tracks of 48 TPI using a head for 487 PI, the data of 2 n tracks of 96 TPI will include the unerased portion 12 of the shaded part 12 in FIG. Since the stored data is superimposed, read errors occur and the reliability of the device is significantly degraded.

[Means for solving problems]

The magnetic head (for wood) of the present invention has a read/write gap, a normal erase gap, and a second
and an erase gap.

〔Example〕

Next, the present invention will be explained using the drawings.

FIG. 1 is a view of a head according to an embodiment of the present invention, viewed from the sliding surface side.

1 is Herad slider, 2 is read/write gap, 3
is a normal erase gap, and an example of a tunnel erase type is shown here. The read/write gap 2 and the erase gap 3 are set to have a gear width for 96 TPI. 4 is a second erase gap for erasing the area outside of the normal erase gap 3, which erases the track adjacent to the track to be read/written by the read/write gear and Yap 2; With this in mind, the gear width is set so that two adjacent tracks will not be erased.

When performing a 48 TPI write operation using the 96 TPI head of this embodiment, by performing an erase operation using the second erase gap 4 during writing, the 96 TPI
Data on odd tracks can be erased. Therefore, even if a magnetic disk written in this manner is read with a 48 TPI head, no read error will occur.

〔Effect of the invention〕

As explained above, in a magnetic recording head, by providing a second erase gap in addition to the normal erase gap that can erase the area outside the normal erase range, a high TPI head can be used to reduce the Even when reading is performed using a low TPI head after TPI writing, read errors can be reduced and high reliability can be ensured.

[Brief explanation of drawings]

FIG. 1 is a diagram of a head according to an embodiment of the present invention viewed from the sliding surface, and FIGS. 2(a) and (b) are schematic diagrams showing a part of a high TPI track and a part of a low TPI track, respectively. It is. 1... Head slider, 2... Read/write gap, 3... Normal erase gap (tunnel erase type), 4... Second erase gap. 1N1. 〆′

Claims (1)

[Claims] read/write gap, normal erase gap,
A magnetic recording head characterized in that the normal erase gap includes a second erase gap for erasing an area outside the erase range erased by the normal erase gap.