JPH0440764B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present 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 disc-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 popular as a powerful information storage means 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 in contact with each other. However, if dust or the like adheres to the surface of the head, the reading or writing of information may be interrupted. It becomes impossible to 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 is a method in which the operator cleans the head surface with a cleaning tool such as a cotton swab, in which the operator sets a cleaning medium whose shape matches that of the recording medium in place of the recording medium in which the error occurred, and performs the cleaning itself. A method for automatically performing this has been proposed.

However, in either case, if an error occurs, the previous work must be interrupted, resulting in poor work efficiency. That is, in both the former method and the latter method, it is necessary to remove the recording medium from the apparatus when cleaning the head, and after cleaning, the medium must be read and written again.

(c) Purpose of the Invention This invention eliminates the need to remove the recording medium from the device even if an error occurs, and allows the operator to clean the head as part of the process of reading and writing to the recording medium. An object of the present invention is to provide an information reading/writing device for a magnetic storage device that makes cleaning unnecessary.

To this end, the magnetic information reading/writing device according to the present invention provides a recording medium with a cleaning track concentric with the information track, and also cleans the head when an error occurs during reading/writing to the information track. This is characterized in that after the head is positioned and the head is cleaned, the information track is read and written again.

(d) Structure of the invention The present invention will be described in detail below with reference to the drawings.

Fig. 1 is a plan view showing the external appearance of a recording medium called a floppy disk, Fig. 2 is a control circuit schematically showing a magnetic storage device, and Fig. 3 is a circuit diagram showing some details of Fig. 2. be. In Figure 1, the floppy disks are jacket 11 and disk 12.
It becomes more. The jacket 11 is square and rotatably houses the disk 12, and has a center hole in the center, an oblong access hole 11a extending in the radial direction, and a sense hole 11b, and a label 13 on the surface. is attached. The disk 12 is a disk-shaped thin plate, and has a spindle hole 12a and a sense hole 12b.
The disk 12 has a plurality of information track areas 122 arranged concentrically around the spindle hole 12a.
A cleaning track area 121 is set. Such a so-called deck device for writing/reading the recording medium 10 has a function of rotating the recording medium 10, a function of positioning the head with respect to the recording medium 10, and a function of reading/writing. For this purpose, the disk motor DKM, head positioning motor
It has an HPM, a read/write head HD, and its circuitry. Motor DKM is rotation control unit
Constant speed rotation control is performed by the DKC, and its activation is performed by the power-on signal POW or the door close signal DRC of the recording medium storage section.
Motor HPM is controlled by positioning control section HPC. This controls the radial position of the head HD with respect to the recording medium, and moves the head HD in accordance with positioning information DAP instructed from the outside. The head HD is connected to the read/write unit RWC, and the write information DAW and read information DAR are connected to the read/write unit RWC.
Perform the reading. Verification circuit CHK is read information
It checks DAR and outputs an error signal ER in the case of a parity error, for example.

Figure 3 shows the positioning control unit HPC in Figure 2.
This is a circuit diagram showing the details of the target value register.
REG, current value counter CNT, comparison circuit CM,
Includes address generator ADG and timer TM. The register REG is the positioning information DAP indicating the information track on which the head should be positioned or the address generator indicating the cleaning track.
Temporarily stores information from ADG. counter CNT
The drive signal for the motor HPM is fed back and stepped, that is, the count value is the same as the head.
Represents the position in the radial direction of the HD recording medium.
The values of the counter CNT and the register REG are compared and determined in terms of their magnitude by a comparison circuit CM. The result becomes a drive signal for the motor HPM, which performs head positioning. The error signal ER from the verification circuit CHK is input to the timer TM, buffer circuit BUF, and address generator ADG. The error signal ER input to timer TM is
This is the start signal for Timer TM, and the clock signal for Timer TM.
Counts up according to CLK. On the other hand, the error signal ER input to the address generator ADG
causes the address generator ADG to output predetermined position information to the register REG. The error signal ER input to the buffer circuit BUF sets the counter CNT at that time in the buffer circuit BUF.

The timer TM outputs a signal to the buffer circuit BUF after a certain period of time has elapsed. This causes the buffer circuit BUF to transfer the set value to the register REG.
Transfer to.

Next, the operation when an error occurs during writing or reading will be explained. Assuming that the mth track among the plurality of information tracks is being read, the values of the current value counter CNT and the target value register REG both correspond to the mth track. Now, when an error occurs, the timer TM is started, the value of the counter CNT is saved to the buffer circuit BUF, and the address generator
A predetermined address is generated from the ADG.
Since this predetermined address indicates a cleaning track on the recording medium, the head HD is located on the cleaning track. That is, the head HD is cleaned by coming into contact with the cleaning track. When the timer TM times up, the buffer circuit is activated by that signal.
The contents of BUF are set in register REG, so
The motor HPM positions the head HD on the m track. In other words, the head HD cleaning time is determined by the timer.
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. It should be noted 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 the head HD is facing the cleaning track and cleaning is being performed, the output information of the head 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) Effect of the invention As explained above, according to the present invention, the cleaning track is provided concentrically with the information track,
In the event of a read error, etc., the head is forcibly positioned in the cleaning zone, the head is cleaned, and then information is written to and read from the information track again, reducing the operator's load. Moreover, since the head can be cleaned without interrupting the original work, work efficiency is high.

[Brief explanation of drawings]

The drawings relate to the present invention; FIG. 1 is a plan view showing the appearance of a recording medium, FIG. 2 is a control circuit of a magnetic storage device, and FIG. 3 is a control diagram showing details of the head positioning control section in FIG. 2. It is a circuit. In the figure, 10 is a recording medium, 12 is a disk, 12
1 is a cleaning track, 122 is an information track, HD is a head, and HPC is a head positioning control section.

Claims (1)

[Claims] 1. For a magnetic recording medium 10 having a plurality of concentric information tracks, a reading/writing head (HD) is positioned on one information track 122 to read/write information. In the magnetic recording apparatus for performing the above-mentioned magnetic recording apparatus, the recording medium 10 has a cleaning track 121 concentric with an information track 122, and when an error occurs when reading or writing to the information track 122, the head (HD) is Position on cleaning track 121 and head (HD)
A magnetic information reading/writing device characterized in that after cleaning the magnetic information track 122, the information track 122 is read/written again.