JPH01205701A - Data recording controller for floppy disk device - Google Patents

Abstract

PURPOSE:To attain low-order compatibility to low track density by moving a magnetic head in the radial direction of a track to a magnetic medium for the low track density and recording the same data in the same phase in the whole track width. CONSTITUTION:In a low-order compatible mode for which a magnetic head 10 for high track density is used, when a CPU stores sent write data into a buffer memory 13, a read/write circuit 14 prepares read data and outputs them to a demodulation circuit 15 by the control of the CPU 12. Here, the magnetic head 10 is moved to a position 23a on the side of the outer circumference of a target track 22 of a disk for the low track density by a head moving mechanism 11. The magnetic head 10 records magnetically in accordance with the write data to the position 23a of the target track 22 positioned by the action of the read/write circuit 14. Next, the CPU 12 outputs a control signal to the head moving mechanism 11, moves the magnetic head 10 to a position 23b on the side of the inner circumference and makes it perform a recording action.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a data recording control device for a floppy disk drive using a high track density magnetic recording medium.

(Prior Art) In recent years, large storage capacity floppy disk devices employing a servo system have been developed. Floppy disk drives with this large storage capacity have conventional track densities (for example, 1
35TP I), for example 270-5427PI
High track density magnetic recording media such as

By the way, in a device with a high track density of 542 TPI, for example, the track width is about 35 to 40 μm, and a magnetic head with a read/write gap corresponding to this track width is used. On the other hand, a device with a low track density of 135 TPI uses a magnetic recording medium with a track width of about 115 μm. For this reason, in floppy disk drives for high track density, 1. Data cannot be recorded on magnetic recording media with low track density.

(Problems to be Solved by the Invention) In conventional floppy disk drives for high track density, the width of the read/write gear of the magnetic head is small, making it impossible to record data on a magnetic recording medium with low track density. , it was impossible to obtain backward compatibility.

An object of the present invention is to enable a floppy disk device for high track density to reliably record data on a magnetic recording medium for low track density, thereby achieving backward compatibility. An object of the present invention is to provide a data recording control device for a floppy disk device.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a magnetic head that reads/writes data on a high track density magnetic recording medium using a read/write gap corresponding to the track width. A floppy disk device equipped with a buffer memory means for storing write data transferred from the outside, and a method for writing the same data over the entire track width of a low track density magnetic recording medium based on the write data stored in the buffer memory means. This data recording control device includes a control means for controlling recording in the same phase.

The control means records the same data over the entire track width of the low track density magnetic recording medium through the magnetic head that is moved by the magnetic head moving means by a distance corresponding to the track width of the low track density magnetic recording medium. Control.

With this configuration, it is possible to record data of the same phase over the entire track width of a low track density magnetic recording medium whose track width is wider than that of a high track density. Therefore, backward compatibility with low track density magnetic recording media can be achieved.

(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 control device in a floppy disk device of the same embodiment. In FIG. 1, the magnetic head 1G has a high track density (for example, 542
It is used in disk drives for TPI (approx. TPI) and has a read/write gap width of, for example, about 30μ. The head moving machine +Mtt consists of a carriage on which the magnetic head 10 is mounted, a carriage drive circuit, and the like.

The head moving mechanism 11 is a mechanism that moves the magnetic head 1O by a necessary amount in the radial direction of the magnetic recording medium based on a control signal output from a control circuit (CPU) 12. C
The PU 12 is a circuit that controls the drive of the head moving mechanism 11 and controls data recording based on a write gate and write data transferred from a controller (FDC) not shown.

The buffer memory 13 is a memory that temporarily stores write data output from the CPU 12. The read/write circuit 14 is a circuit that supplies a write current to the magnetic disk 10 according to the write data stored in the buffer memory 13, and causes the magnetic recording medium to perform a magnetic recording operation according to the write data. Further, the read/write circuit 14 is a circuit that generates read data (read pulses) according to the reproduced signal read from the magnetic head IO. The demodulation circuit 15 is a circuit for detecting, from the read data output from the read/write circuit 14, a 5sync signal of, for example, an ID field recorded in advance on a track of a magnetic recording medium. When reproducing data, this 5sync signal is transmitted to a VFO using a data separator circuit (PLL circuit).
evenly spaced clock pulses used as synchronization signals for circuits). The phase tuning circuit 1B is a circuit that generates a clock pulse having the same phase as the 5sync signal detected by the demodulation circuit 15, and outputs it to the buffer memory 13 as a read control pulse.

Next, the operation of this embodiment will be explained. First, in the normal mode, the magnetic head IO is moved over the magnetic recording medium by the head moving mechanism 11 and positioned on the target track. The magnetic head 10 is operated by the read/write circuit 14.
Read/read data for the positioned target track
Do a light. The head moving mechanism 11 and read/write circuit 14 are controlled by the CPU 12. Here, as shown in FIG. 2, the read/write gap 21 of the magnetic head IO has a gap width (for example, about 30 μm) corresponding to the track width TW1 of the track 20 at a high track density of about 542 TPI, for example.

Next, in a mode for recording data on a low track density magnetic recording medium (backward compatibility mode), a write operation is performed on the magnetic recording medium by the high track density magnetic head IO.

First, when the write gate and write data are transferred from the FDC, the CPU 12 starts the write mode and stores the write data in the buffer memory 13.

The read/write circuit 14 generates read data from the reproduced signal output from the magnetic head 10 and outputs it to the demodulation circuit 15 under the control of the CPU 12 .

Here, the magnetic head IO is moved by the head moving mechanism 11 to a target track of a magnetic recording medium for low track density. That is, as shown in FIG. 3, the magnetic head IO is moved to a position Fl 23a on the outer circumferential side of the target track 22 at low track density, for example. The track width TW2 of the track 22 is, for example, about 90 μm, which is about three times the track width TW1 shown in FIG.

The demodulation circuit 15 detects the sync signal recorded in the ID field of the track 22 from the read data output from the read/write circuit 14 and outputs the sync signal to the phase tuning circuit 16.
Output to. The phase tuning circuit I6 outputs a read control pulse, which is a clock pulse having the same phase as the S yn C signal, to the buffer memory 13, and reads/writes write data from the buffer memory 13 in synchronization with this read control pulse.
It is output to the write circuit 14. Read/write circuit 14
supplies a write current according to the write data from the buffer memory 13 to the magnetic head IO. As a result, the magnetic head 10 performs magnetic recording on the position 23a of the track 22 in accordance with the write data.

Next, the CPU 12 outputs a control signal to the head moving mechanism 11 to slightly move the magnetic head lO toward the inner circumferential side of the track 22 to position 23b in FIG. 3 (off-track). . After this, the CPU 12 repeats the write operation as described above. That is, write data is transferred from the buffer memory 13 to the read/write circuit 14 in synchronization with the clock pulse from the phase-tuned circuit IB.
Output to. The magnetic head 10 is supplied with a write current according to the write data from the read/write circuit 14, and performs magnetic recording according to the same data recorded at the position 23a with respect to the position 23b of the track 22. Furthermore, the magnetic head IO is moved to the track position 23c and magnetically records the same data recorded at the position 23b.

In this way, in the backward compatibility mode, the magnetic head 1
0 is moved in the radial direction of track 22, and track 2
The operation of magnetically recording the same data in the same phase for the full width TW2 of 2 is performed. Therefore, as shown in FIG.
With the magnetic head 10 of approximately 90 μm, it is possible to perform magnetic recording according to predetermined write data on a track with a wide track width TW2 of approximately 90 μm. In this case, the same data is recorded over the entire track width with the same phase based on the 5sync signal. Therefore, data recorded on the track 22 can be reliably reproduced in the read mode.

[Effects of the Invention] As described in detail below, according to the present invention, data can be reliably recorded on a magnetic recording medium for low track density in a floppy disk device for high track density. I can become. Therefore, it is possible to realize backward compatibility for low track density applications.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a data recording control device according to an embodiment of the present invention, and FIGS. 2 and 3 are conceptual diagrams for explaining the operation of the embodiment, respectively. lO...Magnetic head, 11...Head moving mechanism, 1
2... Control circuit, 13... Buffer memory, 14.
・Read/write circuit, 15 ・Demodulation circuit, 1G・
...Phase tuning circuit.

Claims (2)

[Claims] (1) A magnetic head that reads/writes data on a high track density magnetic recording medium using a read/write gap corresponding to the track width, and a low track density that has a wider track width than the high track density. buffer memory means for storing write data transferred from the outside in a mode for recording data on the magnetic recording medium of the magnetic recording medium; magnetic head moving means for moving in the radial direction of the magnetic recording medium; and write data stored in the buffer memory means through the magnetic head moved by the magnetic head moving means on the low track density magnetic recording medium. 1. A data recording control device for a floppy disk device, comprising: control means for controlling recording of the same data in the same phase over the entire track width. (2) A magnetic head that reads/writes data on a high track density magnetic recording medium using a read/write gap corresponding to the track width, and a low track density magnetic head that has a wide track width relative to the high track density. buffer memory means for storing write data transferred from the outside in a mode in which data is recorded on a magnetic recording medium; and buffer memory means for storing write data transferred from the outside in a mode in which data is recorded on a magnetic recording medium; phase detection means for detecting the recording phase based on the phase detection means; phase tuning means for outputting write data from the buffer memory means in synchronization with the phase detected by the phase detection means; a write means for outputting a write current to the magnetic head according to the output write data; and moving the magnetic head in the radial direction of the magnetic recording medium by a distance corresponding to a track width in the low track density magnetic recording medium. a magnetic head moving means for moving the magnetic head, and a write current from the writing means is supplied to the magnetic head moved by the magnetic head moving means to record the same data over the entire track width of the low track density magnetic recording medium. 1. A data recording control device for a floppy disk device, comprising: control means for controlling.