JPH02110803A - Recording method - Google Patents

Abstract

PURPOSE:To attain the exchange between recording media even if they are flexible disk devices (FDDs) with different TPI (track per inch) by employing a magnetic head whose width of an erasure gap in the track width direction is wider than the width of an R/W gap. CONSTITUTION:A flexible disk device (FDD) has the mode with a narrow track pitch (high TPI mode) and the mode with a wide track pitch (low TPI mode). In this case, the core part of the magnetic head consists of an R/W core 1 including a recording/reproduction gap (R/W gap 2) and an E core 4 including an erasure gap (E gap 3) narrower than the width of the R/W gap. Then the magnetic head whose width of the erasure gap in the track width direction wider than the width of the R/W gap is employed, then recording is applied in the mode with the narrow track pitch without the flowing of the erasure current at recording and in the mode with the wide track pitch mode with the flowing of the erasure current. Thus, the exchange of media between FDDs with different track pitch is attained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a flexible disk device.

[Conventional technology]

Regarding conventional flexible disk devices (hereinafter referred to as FDD) with different track pitches, 3° 5-inch FD
This will be explained using D as an example.

In FDD, track pitch is expressed by the number of tracks per inch, and is referred to as TP (tracks per inch).
is displayed. In an FDD, a magnetic head as shown in the general view of a conventional magnetic head in FIG. 6 is used. The erase core (abbreviated as E core 11) that performs erasing and the recording/reproducing core (abbreviated as R/W core 12) that performs recording and reproduction are slider 1.
A sliding surface 17 is formed on this, and the sliding surface 17 contacts the recording medium to perform recording and reproduction.The E core 11 has an El wire 13, and the R/W core 12 has an R wire. /
A W winding 14 is wound thereon, and recording is performed by passing a current through this.

An enlarged view of the core of a conventional magnetic head is shown in Figure 7 for low TPI and Figure 8 for high TPI.
A wide R/W gap 10 is formed in the R/W core 2, and E cores 11 narrower than the R/W core 12 are arranged on both sides of the R/W core 12, including the E gap. . By erasing both sides of the signal recorded by the R/W gap 10, the E gap 9 erases signals other than the signal even when the signal is reproduced by the R/W gap slightly shifted from the recorded signal. This is provided to prevent noise from being reproduced and to ensure error-free reproduction. This is necessary in devices where the media is exchanged, such as FDDs.

In high TPI heads, as shown in Figure 8, the R/W gap 2 is formed in the R/W core 1 and there is often no E core. R on the position where the signal is recorded correctly, that is, on the track.
/W gap is placed, so most signals and R/W
This is because there is no need to provide erased areas on both sides of the signal since no positional displacement occurs between the gaps. Conventionally, low T
Separate FDD using PI head and high TPI head
was being manufactured.

[Problems to be Solved by the Invention] The FDD using the above-described magnetic head has the following problems. The biggest advantage of an FDD is that the recording medium can be exchanged, but it is not possible to exchange the recording medium between an FDD using a conventional high TPI head and an FDD using a low TPI head. As shown in , when a recording medium recorded in low TPI mode on a high TPI FDD is reproduced on a low TPI FDD, the useless signal 18 adjacent to the useful signal 19 also has a wide R/R/
Useful signal 1 because it is played simultaneously with W gap 9
I can't read 9.

Therefore, the recording method of the present invention solves these problems, and its purpose is to record FDs with different TP constructions.
F can exchange recording media and exchange information even between D.
It is to provide DD.

[Means to solve the problem]

The recording method of the present invention provides a flexible disk device having multiple operation modes with different track pitches.
It consists of a R/W core having a recording/reproducing gear for recording and reproducing, and a pair of erase cores having an erase gap disposed on both sides of this magnetic core for erasing, and the width of the erase gap in the track width direction is the R/W core. A magnetic head wider than the width of the gap is used, and in a mode with a narrow track pitch, recording is performed without flowing an erase current, and in a mode with a wide track pitch, recording is performed with an erase current flowing.

〔Example〕

Although the FDD of the embodiment using this recording method has a plurality of recording and reproducing modes, for simplicity, a case will be described in which it has two recording and reproducing modes. A mode with a narrow track pitch is called a high TPI mode, and a mode with a wide track pitch is called a low TPI mode. In the low TPI mode, the medium is exchanged with a low TPI dedicated FDD.

Figures 1 and 2 show enlarged views of the core portion of the magnetic head used in this recording method.
The E-core 4 includes an erase gap (abbreviated as E-gap 3) narrower than the width of the R/W gap. FIG. 2 shows a laminate type, consisting of an R/W core 1 including an R/W gap 2, an E core 4 including an E gap 3, and a spacer 5. Table 1 shows examples of the R/W gap width and the E gap width.

Table 1 135TPI in the table is currently used as the mainstream in 3.5-inch FDDs, and at 135TPI, the E-gap width is narrower than the R/W gap width, but for 270TP or more, the E-gap width is narrower than the R/W gap width. R is better
/W is wider than the gap width. 135TP engineering F
It is intended that the recording medium be interchangeable between a DD and an FDD of 270 TPI or more.

In the high TPI mode of an FDD using such a head, recording is performed as shown in FIG. That is, in this mode, since recording is performed without passing current through the winding of the E core 4, signals can be recorded on the tracks shown in the figure. High TPI mode uses servo technology so there is no track position shift and there is no need to erase both sides of the signal. On the other hand, it is easily possible to reproduce a recording medium recorded using a low TPI dedicated FDD using an FDD using this recording method. When recording, as shown in FIG. 4, when recording on N tracks, both sides of the recorded signal 7 are erased by wide E gaps 3. Figure 5 shows how this recording medium is reproduced using a low TPI dedicated FDD. No. 18 7 recorded in low TPI mode is reproduced with an R/W gap 9. Although the signal width is narrow, the R/W gap is Since the gap 9 is wide, even if a slight positional deviation occurs between the signal 7 and the R/W gap 9, there is no decrease in the reproduction output, and information can be read without error.

Table 1 is a table of core dimensions of magnetic heads in the present invention and conventional embodiments.

〔Effect of the invention〕

The recording method as described above has the effect of providing an FDD that allows medium exchange between FDDs with different track pitches.

The demand for increasing the recording capacity of FDDs is increasing year by year. In order to increase the recording capacity, it is necessary to narrow the track pitch, that is, increase the TPI. However, on the other hand, the biggest advantage of FDD is that the recording medium can be replaced, so conventional low TPI dedicated FDD
At the same time, it is strongly desired to be able to exchange information between the new high TPIFDD and the new high TPIFDD. Conventionally, if the TPI was different, it was impossible to record with a high TPIFDD on a medium recorded with a low TPIFDD, but according to the present invention, it becomes possible. As a result, an increase in the recording capacity of the FDD by increasing the TPI can be easily accommodated in the lj field.

"!+50!i?PM'?1a)t"F3 FIG. 1 is an enlarged view of the core portion of the magnetic head used in the recording method of the embodiment of the present invention.

FIG. 2 is an enlarged view of the core portion of a magnetic multi-drive used in a recording system according to another embodiment of the present invention.

FIG. 3 is a schematic diagram showing recording in the high TPI mode of the present invention.

FIG. 4 is a schematic diagram showing recording in the low TPI mode of the present invention.

FIG. 5 is a schematic diagram showing how a medium recorded in the low TPI mode of the present invention is reproduced by a low TPI dedicated FDD.

FIG. 6 is an overview diagram of a magnetic head used in a conventional recording method.

FIG. 7 is an enlarged view of the core of a magnetic head used for low TPI in a conventional recording method.

FIG. 8 is an enlarged view of the core of a magnetic head used for high TPI in a conventional recording system.

Figure 9 shows how a medium recorded using a conventional recording method on a high TPI FDD is played back on a low TPI FDD. January It・ 1... R/W core 2... R/W gear ↑ knob 3... E gap 4... E U, A 5... Spacer 6... In high TPI mode Recorded signal 7...low T
Signal 8 recorded in P, I mode...Signal 9 recorded with low TPI dedicated FDD...R/W gap 10...E gap 11...E core 12...R/W core 13...8 winding 14...R/W winding 5...slider 6...slider 7...sliding surface 8...useless signal 9...useful signal and above

Claims (1)

[Claims] A flexible disk drive having multiple operation modes with different track pitches is composed of an R/W core having a recording/reproducing gap for recording and reproducing, and a pair of erasing cores disposed on both sides of this magnetic core and having an erasing gap for erasing. A magnetic head in which the width of the erase gap in the track width direction is wider than the width of the R/W gap is used, and in the mode with a narrow track pitch, recording is performed without flowing an erase current during recording, and in the mode with a wide track pitch, recording is performed without flowing an erase current. ,
A recording method characterized by recording by flowing an erasing current.