JPS58211308A - Reading and writing system of magnetic information - Google Patents

Abstract

PURPOSE:To reduce the load of an operator, by setting a cleaning track concentrically with an information track, positioning forcibly a head at a cleaning zone to clean the head and then performing the writing and reading to the information track again. CONSTITUTION:A disk 12 contains plural information track regions 122 and cleaning track regions 121 which are set concentrically with the center of a spindle hole 12a. A deck device which performs reading/writing to a recording medium 10 such as the disk 12 has the revolving function of the medium 10, the head positioning function to the medium 10 and the reading/writing function. Therefore the deck device contains a disk motor DKM, a head positioning motor HPM and a reading/writing head HD with its circuit. The motor DKM receives a control from a revolution control part DKC for the revolution control of a fixed speed, and a power supply application signal POW or a door closing signal DRC of a recording medium storing part is used to start the motor DKM.

Description

Detailed Description of the Invention (a+ Technical Field of the Invention This invention relates to a magnetic recording device in which a head moves relative to a disc-shaped magnetic recording medium to write or read information. .

(b) Technical Background and Prior Art A floppy disk device that uses a flexible disk-shaped recording medium called a floppy disk has a large storage capacity despite its small size, and can store information. Because it has the advantage of being easy to handle, it is becoming an important information storage method for office automation. In such magnetic storage devices, information is read and written while the recording medium and the head move relative to each other, especially without force, but if dust or the like adheres to the surface of the head, the information may be lost. It becomes impossible to read and write accurately. So-called read errors and write errors occur, and various methods have been proposed for dealing with errors when they occur, all of which involve cleaning the head. One method is to clean the surface of the head with a cleaning tool such as a cotton swab.
In place of the recording medium in which the error occurred, a cleaning medium whose shape matches that of the recording medium is set in the apparatus.

A method of automatically performing the cleaning itself has been proposed.

However, in either case, if an error occurs, the work at Natsu@Ma is interrupted and the work is inefficient. In other words, in both the former method and the latter method B and C, it is necessary to remove the recording medium from the apparatus when cleaning the head, which increases the demand for reading the medium again after cleaning.iC) Invention The purpose of this is that even if an error occurs, there is no need to remove the recording medium from the device, and one read/write operation for the recording medium can be performed.
The present invention provides a magnetic storage device in which the τ verator does not have to worry about head cleaning by cleaning the head as one process.

For this purpose, the present invention provides magnetic information reading/a sending power: i:
, provides a zero-circle-shaped cleaning track on the recording medium, as well as an information track, and also provides reading/reading to the information track.
The present invention is characterized in that when an error occurs during writing, the head is positioned on a cleaning track and the head is cleaned, and then the information track VC is read again.

(C1) Structure of the Invention The present invention will be explained in detail below with reference to the drawings. Figure 1 is a plan view showing the appearance of a recording medium called a floppy disk. FIG. 3 is a circuit diagram showing some details of FIG. 2. In Figure 1, the floppy disk consists of a jack 11 and a disk 12. paul l
la and a sense hole 11b, and a lape and /I/13 are pasted on the 9 surface. The disk 12 is a disk-shaped thin plate, and supports a spindle pole 12a and a sense hole 12b.

On the disk 12, a plurality of one-stroke positive track areas 122 and cleaning track areas 121 are set in the same zero circle shape with the center of the spindle pole l2a2. The writing/reading side so-called deck device for such a recording medium 1o has a function of rotating the recording medium 1o, a function of positioning the head with respect to the recording medium 10, and a reading/writing function. For this purpose, we use a disk motor KM and a head positioning motor HPM.

It has a read/write head HD and a circuit therefor. The motor DKM is controlled to rotate at a constant speed by the rotation control unit DKC, and its startup (power-on signal P'Th
W chirui is the door close signal I, R of the recording medium storage section.
This is done by C. The motor HPM is controlled by a positioning control unit E (PC. This is a head) (D) that controls the radial position with respect to the recording medium.
The head HD is moved in accordance with the positioning information DAP instructed from the outside.The head HO is connected to the read/reject part RWCK, writes the write information -l, and reads the read information DAR.
Perform reading. The verification circuit CHK reads the read information AR
9. For example, in the case of a parity error, an error signal ER is output.

Figure 3: is the positioning control section Ei P C in Figure 2.
2 is a circuit diagram showing details of the target value register REG.

Current value counter CNT, comparison circuit C14. It has an address generator ADG and a timer TM. Regimeta REG temporarily stores information such as positioning information DAP indicating an information track for positioning the head or address generator ADG indicating a cleaning track. The counter CNT is incremented by feedback of the drive signal to the motor HPM, and its count value represents the position of the head HL in the radial direction of the recording medium. The values of the counter CNT and the register REG are compared and determined by a comparison circuit C○M. The result becomes a drive signal for motor E (PM, and performs head positioning. Error signal ER from collation circuit CH is input to timer TM, buffer circuit BUF, and address generator ADG. Error signal input to timer TM ER becomes a start signal for the timer TM, and the timer TM counts up according to the clock signal S-K.On the other hand, the error signals F and R input to the address generator ADG cause the address generator ADG to generate predetermined position information. The error signal ER input to the buffer circuit BUF sets the counter CNT at that time to the buffer circuit BUF.The timer TM outputs a signal to the buffer circuit BUF after a certain period of time has elapsed. The circuit B UF' transfers the set value to the register REG.

Next, the operation when an error occurs during writing or reading will be explained. Assuming that the mth track among the plurality of A report tracks is being read, the values of the current value counter CNT and the target value register RΣU both correspond to the mth track. Now, when an error occurs, the timer rM is activated, the counter CNT is saved to the buffer circuit BaF for one shift, and a predetermined address is generated from the address error register ADG. Since this predetermined address indicates a cleaning track on the recording medium, the head HD is positioned on the cleaning track. That is, the head EID is cleaned by coming into contact with the cleaning track.

When the timer Tlv1 times up, the contents of the /X buffer circuit BUF are loaded into the register REG by the signal, so that the motor HPM positions the head HD at the m track. That is, the cleaning time of the head HD is controlled by the timer TM, and when the cleaning is completed, the head HD returns to the track where the error occurred, and information is read or written to that track. Note that if an error occurs again at that time, there is no limitation as to whether reading or writing is performed after the head is re-cleaned, or whether it is determined as an error. Further, if H heads are facing the cleaning track and cleaning is not being performed, the output information of the heads is ignored. Furthermore, if the cleaning track is provided in the middle of a plurality of tracks on the recording medium, the average time from the occurrence of an error to the start of head cleaning can be shortened.

(e) As described in detail, according to the present invention, a cleaning track is provided concentrically with the information track, and when a read error occurs, the head is forcibly positioned in the cleaning zone and the head is cleaned. Because information is written to and read from the information track again later,
The load on the overlay is reduced and the head can be cleaned without interrupting the original work, resulting in high work efficiency.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings relate to the present invention; FIG. 1 is a plan view showing the external appearance of a recording medium; FIG. 2 is a control circuit of a magnetic storage device;
FIG. 3 is a control circuit showing details of the head positioning control section in FIG. 2. In the figure, 10+-i recording medium, 12 is a disk, 121 is a cleaning track, and 122 is an information track. aD'ri head, HPC indicates a head positioning control unit. 1st r2'1 1+Q R at 21st

Claims (1)

[Claims] Magnetic storage in which a reading/writing head is positioned on one information track to read/write information from a recording medium having a plurality of information tracks in the same circular shape. In addition to the apparatus, the SJ recording medium has a circular cleaning track that is the same as the information track, and when an error occurs when reading or writing to the information track, the head is positioned on the cleaning track and the head is removed. After doing all the cleaning. A method for reading and writing magnetic information, characterized in that reading and writing to the above-mentioned information track is carried out again.