JPH03168983A - Floppy disk device - Google Patents

Abstract

PURPOSE:To read out and restore the error of an off-track by correcting the positional deviation of a track position and a magnetic head when an error arises in the reading out from a magnetic recording medium. CONSTITUTION:An error signal S 1 sent to an interface circuit 2 is received in an error receiver 11 and a counter 10 indicates the first error when an external host system 1 detects the reading out error from the magnetic recording medium 6. Then, a track position correcting circuit 9 sends a correction instruction which moves a magnetic heqad 5 by a step motor driver 8, thereby balancing the excitation current of a step motor 7. If the reading out error from the medium 6 is further detected, the same operation is repeated and the magnetic head 5 is slightly moved until the errors are no longer generated. A mechanical positional deviation arises between the position of the tracks and the position of a head 5 and the reading out and restoring of the data on the read error of the generated off-track are executed.

Description

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

[Conventional technology]

FIG. 4 is a block diagram showing an example of a conventional floppy disk device.

In a conventional floppy D disk device, the position of the magnetic head 5 is determined at the equilibrium point of two-phase excitation of the step motor 7 for moving the magnetic head 5, and the position of the magnetic head 5 with respect to each track is determined. are fixed and determined respectively.

[Problem to be solved by the invention]

In the conventional floppy disk device described above, the position of the magnetic head of each track is fixed, so the magnetic head may change due to changes in the environment in which the magnetic recording medium is loaded or unloaded, or due to differences in various conditions in other floppy disk devices. A mechanical misalignment occurs between the position of the track to be read on the recording medium and the position of the magnetic head, and the disadvantage is that it is not possible to read and repair the data of off-track read slurs that occur due to this. I have 1-.

[Means to solve the problem]

The 22-bit disk device of the present invention includes a magnetic head for writing data from a magnetic recording medium, and a two-phase step for moving the magnetic head. When an error occurs in reading from the magnetic recording medium in a flexible disk drive having a 1-night stand, the rack position is slightly moved in response to a λ error signal from an external host 1 system. a track position correction circuit that sends a correction instruction to cause the track position correction circuit to move; and a step motor driver that minutely changes the excitation balance of the two-phase step motor by at least two steps or more in both directions in response to the correction instruction from the track position correction circuit. It is being considered.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a floppy disk device according to the present invention. Further, FIG. 2 is a timing chart showing an example of the error code from the external host system and the excitation current of the step motor. Part 1-Third
The figure is an explanatory diagram showing the positional relationship 4 between the data rack and the read range of the magnetic head.

In Fig. 1, the excitation current of the step motor 7 is
When the magnetic head 5 is set to the A. If the phase A is smaller than the phase B, the magnetic head 5 will be moved slightly toward the B phase.

Therefore, when the external host I/system detects a read error from the magnetic recording medium 6, the error receiver 11 receives the error number S1 sent to the interface circuit 2, and the counter 10 detects the first error. show. Therefore, the track position correction circuit 9 sends the first correction instruction,
As shown in FIG. 2, the step motor driver 8 balances the excitation current from state a during normal lead, where the A-phase excitation current S2 and B-phase excitation current S3 are balanced, to state b during the first minute movement. do. At this time, as shown in FIG. 3, the read ranges 1 and 7 of the magnetic head 13 are shifted by 1-° with respect to the data track 12 during the first minute movement from the normal read state A. In the current state, move for the set amount of movement.

Then, data reading is performed and the magnetic recording medium 6 is read again.
If a reading error occurs, please re-read the error message S.
1, the counter 10 indicates the 24th slur. Therefore, the track position correction circuit 9 sends a second correction signal, and the step motor driver 8 controls the step motor 7.
The excitation current is changed from state b during the first minute movement in FIG. 2 to state C during the second minute movement. At this time, the third
The read range 13 of the flash magnetic head moves from the open state during the first minute movement to the state C during the second minute movement, and moves by 1-1μm compared to the state A during normal read. become. Further, data reading is performed, and when a reading error occurs in the magnetic recording medium 6, the counter 10 indicates the third slur by the third slur signal S1. Therefore, the track position correction circuit 9 sends a third correction signal to change the excitation current of the step motor 7 by the step motor driver 8 from the state C during the second minute movement in FIG. 2 to the state C during the third minute movement. Put it in state d. At this time, the continuous range 1-13 of the magnetic head in Fig. 3 moves from the state C during the second minute movement to the state 2 during the third minute movement, by +2βμm compared to the state A during normal movement. It becomes a state.

As a result, as shown in FIG. 3, if the read range 13 of the magnetic head almost coincides with the data l/rack 12, then in the next data read, the read range 13 of the magnetic recording medium 6
−． Normal reading is performed without the error being detected.

Through the above steps, the magnetic head 5 is moved minutely, and the number of movements is counted by the counter 1. By counting from 0 and repeating the process from 1 to a predetermined number n times until no read errors occur from the medium, it is possible to read and repair the data of read errors due to off-track.

〔Effect of the invention〕

As explained above in 1-1, the floppy pull-and-depasta device of the present invention is capable of handling the magnetic recording medium due to changes in the medium loading/unloading environment of the magnetic recording medium or differences in various conditions in other floppy 4-disk I devices. A mechanical misalignment occurs between the position of the track to be read and the position of the magnetic head,
Because of this, it is possible to read and repair the data of off/rack read/do errors that occur, which has the effect of greatly expanding the range of adaptability of media and equipment to the environment. There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the floppy disk device of the present invention, FIG. 2 is a timing chart showing an example of an error code from an external host system and excitation current of a step motor, and FIG. 4 is a positional relationship explanatory diagram showing the positional relationship between a data track and a read range of a magnetic disk, and FIG. 4 is a block diagram showing an example of a conventional floppy disk device. I... External host 1 system, 2 Old interface D path, 3... Main controller, 4
...read/write circuit, 5...magnetic circuit, 6...magnetic recording medium, 7...
...Step motor, 8...Step motor driver, 9...l.Rack position correction circuit, 1
0...Counter, 11...Error receiver, 12...Data rack, 13...
・・・Magnetic 1...Tsudo readout 11 range, S1...
・Error i, S2...A phase excitation current, S3・
...B phase excitation current.

Claims (1)

[Claims] In a floppy disk device having a magnetic head for reading from and writing to a magnetic recording medium and a two-phase step motor for moving the magnetic head, when an error occurs in reading from the magnetic recording medium. a track position correction circuit that receives an error signal from an external host system and sends a correction instruction to slightly move the track position; and a track position correction circuit that receives a correction instruction from the track position correction circuit and adjusts the excitation balance of the two-phase step motor in at least both directions. 1. A floppy disk device comprising: a step motor driver that causes minute changes in two or more steps.