JPH10106177A - Disk memory - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk memory whose handling is simple and whose reliability is high. SOLUTION: This memory is composed of one pair of recording and reproducing heads performing a read/write with respect to a disk storage medium which has recording surfaces on both surfaces and which is detachable, one pair of read/write amplifiers corresponding to the heads, a position control mechanism performing position controls of the recording and reproducing heads and a control circuit. This control circuit enables the same data to be written on both surfaces of the disk storage medium by activating one pair of write amplifiers at the time of a write mode and at the time of a read mode, the circuit enables data from the surface of one side of the disk storage medium to be read by making the output of the read amplifier of one side effective and enables the data recorded on the surface of other side to be read out by making the output of the read amplifier of the other side effective when the read-out of data from the surface of one side is disabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk memory device, and more particularly to a technique effective for protecting data in a disk memory device having a removable disk storage medium.

[0002]

2. Description of the Related Art In a file management system based on a personal computer or a workstation, data is recorded in a hard disk memory device built in the personal computer, and for backup use, data is recorded in a floppy disk memory device or a magneto-optical disk memory device. Data is stored in a removable (removable) recording / reproducing medium using a reproducing apparatus. Backup work is
This is important as a data protection measure in the case where recorded data is destroyed due to damage to a work hard disk memory device or the like.

[0003]

It is troublesome to record the recording data of the backup hard disk memory device or the like one by one on another removable recording / reproducing medium. In recent years, a floppy disk memory device using a low-cost, large-capacity recording medium of about 100 MB (megabytes) has attracted attention. Also, the storage capacity of magneto-optical disk memory devices tends to be further increased.
Since the storage capacity of such a removable recording / reproducing medium is increasing, and enormous data can be recorded with the increase in the storage capacity, if data destruction due to a recording medium defect or the like occurs in a part thereof, It is extremely difficult to reproduce it 100%.

An object of the present invention is to provide a highly reliable disk memory device which is easy to handle. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0005]

The following is a brief description of an outline of a typical invention among the inventions disclosed in the present application. That is, a pair of recording / reproducing heads for reading / writing from / to a removable disk storage medium having recording surfaces on both sides, a pair of read / write amplifiers corresponding thereto, and a position for controlling the position of the recording / reproducing head. The control circuit comprises a control mechanism and a control circuit. The control circuit activates the pair of write amplifiers in the write mode to write the same data on both sides of the disk storage medium, and in the read mode, controls one of the read amplifiers. With the output enabled, data from one surface of the disk storage medium is read, and when reading of the data from the one surface is disabled, the output of the other read amplifier is enabled to be recorded on the other surface. Data can be read.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a main part related to a read / write unit in a disk memory device according to the present invention. The recording medium is made of a floppy disk or a magneto-optical disk or the like, is detachable, and has both sides as recording surfaces 1a and 1b. Although not particularly limited, recording / reproducing heads 2a and 2b are provided corresponding to the two recording surfaces. Each of the recording / reproducing heads 2a and 2b does not necessarily have to be an electrically single head, and a recording-only head and a reproducing-only head may be integrated.

Although not particularly limited, the read / write circuit 8 is constituted by one semiconductor integrated circuit, and is provided with the following circuits. Read amplifiers 3a and 3b and write drivers 4a and 4b are provided corresponding to the recording / reproducing heads 2a and 2b. That is, the signals read from the recording / reproducing heads 2a and 2b are transmitted to the read amplifier 3
a and 3b, respectively, and the signal is amplified by the read amplifier 3a through the buffer amplifier 5 during normal reading.
Conveyed to.

The write data formed by the encoder 11 (not shown) is input to the frequency dividing circuit 6. The output signal of the frequency divider 6 is transmitted to the inputs of the write drivers 4a and 4b in common. Instead of the write driver corresponding to the one selected by the selection signal being operated to drive the recording / reproducing head as in the prior art, in this embodiment, the two write drivers 4a and 4b are always in the write mode. Is in the operating state, and the recording / reproducing head 2a
And 2b are driven. Thereby, the recording surface 1a of the recording medium
And 1b are always written with the same data at the same time.

The mode selector 7 receives an operation control signal such as read / write from the microcomputer 10 or the like as a host system. In the read mode, the mode selector 7 sets the read amplifier 3a and the buffer amplifier 5 to an operating state and sets the recording surface 1
The signal read from a is transmitted to the decoder. If,
If the data read from the recording surface 1a has an error and cannot be read, the microcomputer 10
The read amplifier 3b is set in the operating state in accordance with the instruction, etc., and the amplified signal is transmitted to the buffer amplifier 5 so as to switch to reading data from the recording surface 1b.

FIG. 2 is a timing chart for explaining an example of the operation of the disk memory device according to the present invention. FIG. 1A shows the disk configuration, and shows the n-th track on the a-plane and the b-plane corresponding to the recording surfaces 1a and 1b. FIG. 3B shows a timing chart in the write mode, FIG. 3C shows a normal data read mode, and FIG. 3D shows data read from the a-plane. Shows the case where an error has occurred.

As shown in the above (B), in the data write mode, the same data is recorded on both sides of the recording surfaces 1a and 1b of the recording medium. That is, the control signal from the microcomputer 10 is controlled by the mode selector 7 which is a logic circuit so that both the frequency dividing circuit 6 and the write drivers 4a and 4b are in the operating state, and the data of the a-plane and the b-plane are Write the same data to the area (sector). Although there is no particular limitation, the disk configuration of (A)
A plurality of storage units (sectors) in which a servo area and a data area are paired are provided on one track. In the servo area, a clock for synchronization and address information (track, sector) are recorded. In the write mode, after a target track / sector is detected from the servo signal / ID signal written in the servo area on the a-side, the write signal sent from the encoder 11 is frequency-divided by 2 by the frequency dividing circuit 6. Write drivers 4a and 4
The recording / reproducing heads 2a and 2b are driven by b to write the same data on the a-side and the b-side.

As shown in FIG. 1C, in the data read mode, a control signal from the microcomputer 10 is transmitted to the read amplifier 2a by the mode selector 7 which is a logic circuit.
And the buffer amplifier 5 are controlled to be in an operating state, and after detecting a target track / sector from the servo signal / ID signal written in the servo area on the a-plane as described above,
The signal of the data area is taken out. At this time, if an error occurs in data reading due to damage to the a-plane data area due to mechanical or temporal changes due to careless handling or the like and deterioration in material or the like, the data is shown in (D). As described above, the mode selector 7
In order to detect the servo information from the servo area of the surface, the servo information is taken out while the read amplifier 3a is operating, and after detecting the target track / sector, the read amplifier 3b is switched to take out the data from the surface b. It is to be. Since a servo area also exists on the b-side, if a defect occurs in the servo area on the a-side,
The data of the a-plane or the data of the b-plane are obtained using the servo area of the b-plane.

FIG. 3 is a block diagram showing one embodiment of the magnetic disk drive according to the present invention. Although not particularly limited, the magnetic disk device of FIG. 1 is mounted on a notebook personal computer.

The magnetic disk drive uses the removable recording / reproducing medium 1 as described above, and in addition to the read / write circuit 8 as shown in FIG. 1, a decoder 9 for receiving read data from the read / write circuit 8, An encoder 11 that supplies write data to the read / write circuit 8 is provided. The microcomputer 10 controls a signal circuit of the decoder 9, the encoder 11, and the read / write circuit 8 using a memory circuit 17 including a ROM in which a program is written and a RAM serving as a temporary storage circuit. Operation control of a position control circuit 12 including a spindle motor driver and a head actuator driver for driving and controlling a spindle motor 13 for rotatingly driving the recording / reproducing medium 1 and a head actuator 14 provided with position control of a magnetic head, respectively. I do.

The disk control circuit 15 includes a disk controller, an interface controller, and a bus driver, and performs generation of read / write data, detection of the ID information, error detection, and correction thereof. The cache memory 16 serves as a buffer memory, and inputs and outputs data to and from a personal computer via the cache memory. Thus, data input / output to / from the magnetic disk memory as viewed from the personal computer is performed at high speed.

The recording / reproducing medium 1 is not particularly limited, but has a large storage capacity of about 100 MB or more. Therefore, since the same data is written on both sides of the write data as described above, the actual storage capacity is reduced by half. However, since there is still more than 50 Mbytes, various data and programs can be stored. Is no problem. In addition, since the data for backup can be secured by a normal write operation, the handling is simplified. That is, a write operation is performed as in a normal disk memory, and if an error occurs and reading becomes impossible, data from the other recording surface can be read as described above.

In the case of a removable recording / reproducing medium, there is a great risk that the recording surface will be damaged during handling. In addition, when the storage capacity is large as described above, the number of data stored in one file increases, and even if a part of the recording is destroyed, there is a high possibility that the whole becomes useless. The usefulness of the disk memory device according to the present invention, which can be easily solved, is extremely high.

In a disk memory device, it is generally used as a file memory. Therefore, the recording / reproducing medium 1
If an error occurs in a part of the recording and reproducing medium 1, the error track is double-recorded on both sides of the recording / reproducing medium 1 in the same manner as the data so that the error track can be skipped. A function for performing read / write is added. Although not particularly limited, when the power is turned on, a portion surrounded by the error track is read out in the same manner as the data, and a register or R included in the disk controller or the microcomputer 10 or the like is read out.
The head actuator is registered in the AM, and when a track corresponding to the instruction is instructed, the head actuator is driven to skip the track and move to the next track.

By providing the defect relieving function as described above, even if the above-mentioned defect occurs in a part of the recording / reproducing medium 1 having the large storage capacity as described above, the defect is not caused by the defect. Thus, the defective portion can be used continuously without using it. In particular, if the error track information is registered twice as described above, such error track information can be taken out with high reliability.

The functions and effects obtained from the above embodiment are as follows. (1) A pair of read / write heads for reading / writing a detachable disk storage medium having a recording surface on both sides, a pair of read / write amplifiers corresponding thereto, and position control of the read / write head The control circuit activates the pair of write amplifiers in the write mode to write the same data to both sides of the disk storage medium, and the one in the read mode. The output of the read amplifier is enabled to read data from one surface of the disk storage medium, and when reading of data from the one surface is disabled, the output of the other read amplifier is enabled and the other surface is enabled. By making it possible to read the data recorded in the There are and simple, there is an advantage that it high reliability.

(2) The storage portion from which the data cannot be read out is double-registered as an unusable area in a predetermined recording portion on both sides of the disk storage medium. An effect that a disk storage medium can be effectively used by being read out by a circuit and held in a storage circuit of the control circuit and controlling the position control mechanism with reference to storage information of the storage circuit. Is obtained.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention of the present application is not limited to the embodiment, and various modifications can be made without departing from the gist of the invention. Needless to say. For example, the detachable recording / reproducing medium may be any recording / reproducing medium such as a magnetic disk, a magnetic optical disk, or an optical disk. The disk memory device according to the present invention may constitute the memory device by itself, or may be built in a personal computer or a workstation.

[0023]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows. That is, a pair of recording / reproducing heads for reading / writing from / to a removable disk storage medium having recording surfaces on both sides, a pair of read / write amplifiers corresponding thereto, and a position for controlling the position of the recording / reproducing head. The control circuit comprises a control mechanism and a control circuit. The control circuit activates the pair of write amplifiers in the write mode to write the same data on both sides of the disk storage medium, and in the read mode, controls one of the read amplifiers. With the output enabled, data from one surface of the disk storage medium is read, and when reading of the data from the one surface is disabled, the output of the other read amplifier is enabled to be recorded on the other surface. By making it possible to read backed up data, backup data can always be secured, making it easier to handle. In and can be realized and high reliability.

[Brief description of the drawings]

FIG. 1 is a main block diagram related to a read / write unit in a disk memory device according to the present invention.

FIG. 2 is a timing chart for explaining an example of the operation of the disk memory device according to the present invention;

FIG. 3 is a block diagram showing one embodiment of a magnetic disk drive according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Recording / reproduction medium, 1a, 1b ... Recording surface, 2a, 2b ...
Recording / reproducing head, 3a, 3b ... read amplifier, 4a,
4b: write driver, 5: buffer amplifier, 6: frequency divider, 7: mode selector, 8: read / write circuit,
9 decoder, 10 microcomputer, 11 encoder, 12 position control circuit, 13 spindle motor, 14 actuator, 15 disk control circuit
16: cache memory, 17: memory circuit.

Claims (3)

[Claims] 1. A pair of recording / reproducing heads for reading / writing a detachable disk storage medium having recording surfaces on both sides, and a pair of recording / reproducing heads provided corresponding to the pair of recording / reproducing heads, respectively. A read / write amplifier; a position control mechanism for controlling the position of the recording / reproducing head; and a write mode for activating the pair of write amplifiers to write the same data on both sides of the disk storage medium. In this case, the output of one read amplifier is made valid to read data from one surface of the disk storage medium, and when reading of data from the one surface is disabled, the output of the other read amplifier is valid. And a control circuit for enabling reading of data recorded on the other surface. apparatus. 2. The disk storage medium has a storage capacity of several hundreds of megabytes or more, and the storage portion from which data cannot be read is used as an unusable area by a predetermined recording on both sides of the disk storage medium. The register is double-registered in the portion, and is read out by the control circuit immediately after the power is turned on, is held in the storage circuit of the control circuit, and controls the position control mechanism with reference to the storage information of the storage circuit. 2. The disk memory device according to claim 1, wherein 3. The disk memory device according to claim 1, wherein said disk memory device is mounted on a personal computer.