JPH01137467A - Data recording and reproducing device for floppy disk device - Google Patents

Abstract

PURPOSE:To eliminate an erase area and to securely perform a read operation in a tunnel erase system floppy disk device by outputting an internal write gate signal so as to write data in a prescribed area of an erased recording medium. CONSTITUTION:In a write operation with a low recording density mode, a write gate signal WG and write data WD are outputted from a controller (FDC) 13, while the internal write gate IG with a prescribed pulse duration in synchronization with a tailing edge of the write gate signal WG is outputted by a monostable circuit 14. Consequently, a signal G composed by synthesizing the internal write gate IG with the write gate signal WG is outputted as the write gate to read/write circuit 10 by an OR circuit 15. On the other hand, internal write data ID corresponding to a pulse signal P from an oscillator 18 is outputted by an AND circuit 17 during an output period of the internal write gate IG. By this method, the read/write operation is securely executed, and also the occurrence of a blank area in the precedent erase operation is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a data recording/reproducing device for a floppy disk device of advanced wide erase type.

(Prior Art) Conventionally, in high recording density (for example, 4 Mbytes) floppy disk drives such as perpendicular magnetic recording systems, magnetic heads of the advanced wide erase system have been used. In this type of magnetic head, the erase gap is placed in a position preceding the read/write gap, and the head erases a wide range by leading the tracks of a rotating recording medium.

New data is recorded by the read/write gap on the track that was previously erased by the erase gap.

Here, data writing using the read/write gap is performed in synchronization with a write gate signal output from the controller (FDC). In the advanced wide erase method, the erase operation using the erase gap is performed at the same timing as the write gate signal. For this reason, erased areas (blank areas) are formed in the tracks of the recording medium, where data is not written and remains erased.

By the way, in the above-mentioned high recording density 70TB disk device, the conventionally used low recording density (
For example, it is necessary to ensure backward compatibility with recording media of 1M byte) mode.

However, conventional low-density floppy disk drives use a tunnel erase type magnetic head, which erases not the tracks of the recording medium but between the tracks. is not formed. Therefore, when data is recorded on a recording medium in a low recording density mode in a high recording density floppy disk device, and data is read from the recording medium in a low recording density floppy disk device, the above-mentioned erased area is formed. This will cause read errors to occur.

(Problems to be Solved by the Invention) In the conventional advanced wide erase method floppy disk device, even if it has a read/write function in a low recording density mode, an erase area is formed on the recording medium. compatibility with floppy disk devices is insufficient. That is, in a tunnel erase type floppy disk device, there is a problem in that when a read operation is performed, a read error occurs due to an erased area.

An object of the present invention is to reliably execute read/write operations in a low recording density mode in the advanced wide erase method, and to ensure reliable compatibility with low recording density tunnel erase method floppy disk devices. An object of the present invention is to provide a data recording and reproducing device for a floppy disk device that can perform the following operations.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention, in the advance wide erase method, writes data in a predetermined area of a recording medium that has been erased by the advance erase in a low recording density mode. Data recording of a floppy disk device comprising an internal write gate output means for outputting an internal write gate signal for the purpose of data recording, and a write means for writing data on a recording medium in response to an internal write gate signal output from the internal write gate output means. It is a playback device.

This configuration eliminates the erase area formed by advance erase operation during low recording density mode,
It becomes possible to reliably perform a read operation on the tunnel erase type floppy disk VRW1.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a data recording/reproducing apparatus according to the same embodiment. In FIG. 1, a read/write circuit 10 generates a read error (R/W) according to a read/write operation.
This is a circuit that causes a write current to flow through the coil 11, and also amplifies and outputs a read current that flows through the R/W coil 11. The read/write circuit 10 also includes an erase coil 1.
An erase current is applied to the magnetic head 2 to generate an erase magnetic field from an erase gap (not shown) of the magnetic head.

The FDC 13 is a controller that outputs a write gate signal WG and write data WD necessary for the operation of the read/write circuit 10, and outputs various other interface signals.

The write gate signal WG output from the FDC 13 is input to the first input terminal of a monostaple multipipulator (hereinafter simply referred to as a monostaple circuit) 14 and an OR circuit 15, and is also input to the first input terminal of a read/write circuit 10, a haley gate. It is input as signal EG. The mono-stapling circuit 14 outputs a pulse (hereinafter referred to as internal write gate) IG having a pulse width determined based on a preset CR time constant in synchronization with the fall of the write gate signal WG.

The mono staple circuit 14 is activated by the ON operation of the change-over switch 16, and is brought into a state where the operation is stopped by the OFF operation. The changeover switch 16 is a switch that is turned on by, for example, a signal output from a floppy disk device to instruct a low recording density mode. OR circuit 15
outputs either the write gate signal WG input to the first input terminal or the internal write gate IG input to the second input terminal to the read/write circuit 10.

On the other hand, the AND circuit 17 has an internal write gate IG input to its first input terminal, and a pulse signal P of a predetermined period generated from the oscillator 18 to its second input terminal. As a result, the AND circuit 11 outputs 1.0 during the generation period of the internal write gate IG. Internal write data ID corresponding to a predetermined pulse signal P is output to the first input terminal of the OR circuit 19. The OR circuit 19 has a second input terminal F D
Write data WD from C13 is input, and either write data WD or internal write data ID is output to the read/write circuit 10.

Next, the operation of this embodiment will be explained. First, in this embodiment, a high recording density mode of, for example, 4 Mbytes is the standard mode in a floppy disk device of advanced wide erase type. In this high recording density mode, when data is written to the recording medium, the FDC 13 outputs a write gate signal WG and write data WD as shown in FIG. 2. In this case, since the changeover switch 16 is off, the monostaple circuit 14 is in a non-operational state. Therefore, the write gate signal WG output from the FDC 13 is transferred to the read/write circuit 10 through the OR circuit 15. Further, the write data WD is transferred to the read/write circuit 10 through the OR circuit 19.

The read/write circuit 10 sends a write gate corresponding to the write data WD to the R/W coil 11 of the magnetic head during the output period of the write gate signal WG. As a result, a recording magnetic field corresponding to the write current is generated from the read/write gap of the magnetic head, and magnetic recording is performed on the recording medium at a high recording density according to the write data WD. At this time, the read/write circuit 10 is supplied with the write gate signal WG from the -FDC 13 as the erase gate signal EG. The read/write circuit 10 supplies an erase current to the erase coil 12 at the same timing as the write gate. As a result, an erase magnetic field is generated from the erase gap of the magnetic head, and the tracks of the recording medium are erased prior to the read/write gap.

Next, in high-density floppy disk drives,
Normally, for example, when a 1 Mbyte recording medium is set in a disk device, a signal instructing a low recording density mode is output from the device to the FDC 13. This signal turns on the changeover switch 16. In the low recording density mode, for example, a mark or the like is provided in advance on the recording medium to distinguish between low recording density and high recording density, and when this mark is detected by a charging sensor etc., the low recording density mode is activated. An instructing signal is output.

Even in write operation in low recording density mode, FDC
13 outputs a write gate signal WG and write data WD. Since the changeover switch 16 is in the ON state, the monostapling circuit 14 is in an operating state, and as shown in FIG. 2, outputs an internal write gate IG having a predetermined pulse width in synchronization with the fall of the write gate signal WG. Based on the output of the internal write gate IG, the OR circuit 15 outputs a signal G, which is a combination of the internal write gate IG and the write gate signal WG, to the read/write circuit 10 as a write gate, as shown in FIG. . On the other hand, the AND circuit 17 outputs internal write data I according to the pulse signal P from the oscillator 18 during the output period of the internal write gate IG.
Output D. As a result, the OR circuit 19 outputs the internal write data 10 and the write data W, as shown in FIG.
The combined data D and D are output to the read/write circuit 10 as write data.

As in the case of the high recording density mode, the read/write circuit 10 causes a write current corresponding to the write data WD to flow through the R/W coil 11 of the magnetic head during the output period of the write gate signal WG. As a result, a recording magnetic field corresponding to the write current is generated from the read/write gap of the magnetic head, and magnetic recording is performed on the recording medium at a low recording density according to the write data WD. At this time, the read/write circuit 10 receives an erase gate signal εG.
As a write gate signal WG from the FDC 13 is supplied. The read/write circuit 10 supplies an erase current to the erase coil 12 at the same timing as the write gate. As a result, an erase magnetic field is generated from the erase gap of the magnetic head, and the tracks of the recording medium are erased prior to the read/write gap.

Here, when the output of the erase gate signal EG (that is, the write gate signal WG) is stopped, the read/write circuit 10 stops supplying the erase current to the erase coil 12. Therefore, the erasing operation for the low recording density recording medium is stopped. However, on the other hand, since the output of the erase gate signal EG is stopped, the internal write gate I
G is output, and is outputted to the read/write circuit 10 as a write gate G. Therefore, the read/write circuit 10
is the write data D during the output period of the internal write gate IG.
In other words, R/W the write current according to the internal write data ID.
It flows into coil 11. This allows the magnetic head to read/write
A recording magnetic field corresponding to the write current is generated from the write gap, and magnetic recording according to the internal write data 10 is performed on the recording medium. In this case, the internal write data ID is made up of specific continuous data of all "1's" or all "0", for example.

In this way, in the case of low recording density mode, preset specific data (internal write data IQ) is recorded in a predetermined range after the erase operation is stopped in synchronization with the erase gate at the same timing as the write gate. It turns out.

For this reason, 1. In the advance erase method, the tracks of the recording medium are erased prior to the write operation, so there are areas in the erased state where nothing is written.
In the low recording density mode, specific data as described above will be written in that area. Therefore, in the low recording density mode, low recording density data is recorded on the recording medium, and at the same time, it is possible to prevent the occurrence of blank areas where nothing is recorded in the high recording density mode. As a result, the recording medium on which data has been recorded in the low recording density mode can be erased onto a 1 m long tunnel erase floppy disk.
! When set to , recorded data can be reliably reproduced from the recording medium. That is, since there are no blank areas on the recording medium, it is possible to reliably prevent read errors caused by blank areas. In this case, although the data recorded in the blank area is not originally necessary recording data, by recording predetermined specific data, it is possible to ignore the specific data during playback.

For this reason, even if specific data different from the originally required recording data is recorded, the playback operation is not affected much.

In the above embodiment, it has been explained that the changeover switch 16 is operated by a signal output from the device instructing the low recording density mode, but the present invention is not limited to this. Specifically, for example, the changeover switch 16 may be attached to the outside of the apparatus, and the changeover switch 16 may be manually operated by an operator.

[Effects of the Invention] As detailed above, according to the present invention, in the advance wide erase method, the write/write operation can be reliably executed in the low recording density mode, and the generation of blank areas in the advance erase operation can be prevented. It can be prevented. therefore,
Read/read in low recording density mode as well as high recording density mode
The write operation can be executed reliably and compatibility with conventional tunnel erase type floppy disk devices can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a data recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a timing chart for explaining the operation of the embodiment. 10... Read/write circuit, 11... Read/write coil, 12... Erase coil, 14... Mono staple multivibrator, 15.19... OR circuit, 16-... Changeover switch, 17... Andro path, 18... Oscillator.

Claims (1)

[Scope of Claims] In a data recording and reproducing device for a floppy disk drive using an advanced wide erase method, a write gate output means outputs a write gate signal when writing data to a recording medium in a high recording density mode or a low recording density mode. an internal write gate output means for outputting an internal write gate signal for writing data to a predetermined area of the recording medium erased by advance erasing during the low recording density mode; and an output from the write gate output means. a write means for writing data on the recording medium according to the write gate signal output from the internal write gate output means or the internal write gate signal output from the internal write gate output means. playback device.