JPS61264568A - Flexible disc drive - Google Patents

Abstract

PURPOSE:To record and reproduce information on tracks surely by preventing a magnetic head from being stopped between tracks when a flexible disc recorded with a low-track density flexible disc drive (FDD) is reproduced with a high-track density FDD. CONSTITUTION:An edge detecting circuit 1 detects the level change point, namely,the edge of a carriage feed extent switching signal (a) per one track to output a positive pulse signal (d). A signal (f) is the output of a NOR circuit 2 to which the signal (d) and a system reset signal (e) are inputted and resets excitation phase switching pulse generating circuit 3 and an excitation phase generating circuit 4. The excitation phase generating circuit 4 of a step motor takes signals (g) and (h) as the input and outputs 4-phase step motor excitation phases i1-i4. when the signal (a) is changed, step motor excitation phase outputs i1-i4 are initiaized.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to flexible devices, flexible devices, etc. This invention relates to a flexible disk drive that drives, records, and plays back.

[Summary of the invention]

The present invention is a 7 lexi prude disk drive (hereinafter referred to as F
Regarding the carriage movement control of the FDD (abbreviated as DD), it is possible to reproduce M-type discs with different track densities using the same FDD.

In the present invention, the carriage is controlled by a track density switching signal so that the carriage feed pitch according to the carriage movement command for one track and the stop position when the track density is set to a low track density are precisely set on the track where data is recorded. It is characterized by initializing the circuit.

[Conventional technology]

FDDs with high track densities (for example, 95 TP, TP indicates the number of tracks per inch in the diameter direction of the flexible disk) and low track densities (for example, 49 TP).
When trying to read data on a flexible disk recorded on an FDD with a It is necessary to move two tracks on the disk. As a countermeasure for the above problem, there is Japanese Patent Application Laid-Open No. 58-60469.

[Problems and Objectives to be Solved by the Invention] However, in JP-A-58-60469.

For example, the case where the carriage feed amount switching signal per track (referred to as a track pitch switching signal in JP-A-58-60469) is changed during FDD operation is not considered.

A flexible disk controller (F'
In response to a command to move the carriage one track from DC (abbreviated as DC), if a carriage feed amount switching signal is set per track to accommodate high track density flexible disks, and the carriage is on an odd numbered track. do. Assume that in this state, the carriage feed amount switching signal per track is changed to a specification compatible with a low track density flexible disk.

In a flexible disk, the even numbered tracks of a high track density flexible disk are the same as those of a low track density flexible disk, so in the above situation, the magnetic head will not be located on the track of a low track density flexible disk. It is located at an intermediate position between tracks, making it impossible to reproduce data recorded on a flexible disk. This can be clearly seen from the positional relationship diagram of the trucks in Figure 3.

The present invention is intended to solve these problems, and its purpose is to ensure that data always exists even if the carriage feed amount change signal per track is changed at an arbitrary track position. Does it automatically align the magnetic head on the track? The problem lies in the realization of the functions that are supported within the DD.

[Means for solving problems]

The invention? The DD device is equipped with a means for changing the carriage feed amount per track and a switching terminal in response to a one-track movement command to the FDD by a carriage control circuit, detects a change in the switching signal, and outputs the change output. , is introduced into the carriage control circuit to change the contents of the carriage control circuit so that the magnetic head is positioned on the information track corresponding to the track density.

[Effect]

According to the above configuration of the present invention, the high track density IPDD
When trying to play back a flexible disc recorded on a low track density FDD.

The magnetic head does not stop at an intermediate track and can reliably perform recording and reproduction on the track.

〔Example〕

FIG. 1 is an FDDI:D configuration diagram in an embodiment of the present invention. Reference numeral 1 denotes a circuit for detecting a level change point, ie, an edge, of the carriage feed amount switching signal α per track and outputting a positive pulse signal d.

Signal f is the output of a 2ONOR circuit that inputs signal d and system reset signal af, and resets 3 and 4. 3 is an excitation phase clamp pulse generation - circuit, FD
When a 1-track movement command is input to -D, a 1-excitation phase switching pulse g and a 4-phase step motor 6 rotation direction command signal are output in response to a carriage movement direction command signal C. The number of pulses of the signal g per track is one when the signal α is at the °Hl level, and two when the signal α is at the 1'L6 level.

4 is an excitation phase generation circuit for the step motor, which generates signals y,
ht-Manual power, 4-phase step motor excitation phase Sls
$! s S3e %4, and according to the signal f, s, -i, is a flexible disk recorded with high track density and a flexible disk recorded with low track density.
The excitation phase tt-4ak is reset to the common track position of the disk, and S1e $2 is always at III level j
S3e $4 becomes II, Lebel.

5 is a step motor driver, and the signal il~(4
The width of the motor is increased and it is driven by six four-phase step motors. A timing diagram of the above operation is shown in FIG. 2. As shown in FIG. 2, when the signal α changes, the step motor excitation phase outputs 41 to i4 are initialized to h
Ru.

The previous four figures are track position relationship diagrams on which data is recorded on high track density flexible disks and low track density flexible disks. This is the track position on the disc.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, by detecting a change in the signal α, a recalibration plate operation is performed and the maximum Tracks that are outer tracks
There is no problem in moving the carriage. By software using a microprocessor! ! There is no problem in applying it.

〔Effect of the invention〕

As described above, according to the present invention, the carriage feed amount per track is changed by the feed amount switching signal of the Φ spear per one track movement command, and when the signal is changed, the carriage feed amount is changed by the high track density flexible disk. By initializing to a common track of a low track density flexible disk and changing the playback waveform control signal depending on the state of this signal, the magnetic head stops in the non-recording zone (between the tracks) of the low track density flexible disk. Reliable playback is possible without any problems.

In addition, host systems that perform various types of FDI control also use high track density flexible disks,
In both cases of low track density flexible disks, it is only necessary to switch one signal line, which greatly reduces the burden on the software.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an actual example of a flexible disk drive according to the present invention. wX2 diagram! ! 1 is a timing chart diagram of each signal in FIG. FIG. 3 is a track position relationship diagram of a high track density flexible disk and a low track density flexible disk. l--・Edge detection circuit 3...Excitation holding pulse generation circuit 4...Excitation phase generation circuit 5...Counter or higher

Claims (1)

[Claims] A flexible disk drive consists of a means for rotating a flexible disk medium, a magnetic head for recording and reproducing data, a carriage that supports the magnetic head and moves between tracks, and a carriage control circuit that controls the movement of the carriage. In response to a command to move one track to a flexible disk drive, a carriage control circuit comprising a counting means and a clocking means is provided with means for changing the amount of carriage movement per track and a signal for changing the amount of carriage movement per track, 1. A flexible disk drive characterized in that a carriage control output, which is input to the carriage control circuit and used to position the carriage, is changed to a specific state based on the change output.