JPH09167441A - Disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk recording and reproducing device which can reproduce the data on images, sounds, etc., already recorded while recording the data on images, sounds, etc., SOLUTION: The device is provided with a data input terminal 2 which is used to input the recording data on images, sounds, etc., supplied from a MPEG(Moving Picture Expert Group) encoder 51 inside a host instrument 50 and an output terminal 3 which is used to output the reproduced data of images, sounds, etc., read out from a magnetic disk 11. A hard disk controller section 16 stores recording data into a recording buffer section 17A and concurrently reads the recorded data with a little more than twice its data speed to store into the magnetic disk 11. The controller section 16 stores the reproduced data read out from the magnetic disk 11 into a reproducing buffer 17B and concurrently reads the stored reproduction data with a specified speed to supply to the MPEG decoder 52 inside the host instrument 50. These recording and reproducing actions are alternately repeated in a time-shared manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus such as a magnetic disk apparatus, a magneto-optical disk apparatus, etc., and more specifically, it performs a recording operation and a reproducing operation on a disk in a time-division manner and inputs and outputs recording data. The present invention relates to a disc recording / reproducing apparatus capable of outputting reproduction data simultaneously and continuously.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a conventional disc recording / reproducing apparatus. In FIG. 4, the magnetic disk recording / reproducing apparatus 100 is illustrated as the disk recording / reproducing apparatus, and the connection with the host device 200 is also shown.

The magnetic disk recording / reproducing apparatus 100 and the CPU 201 on the host device 200 side are provided with SCSI (Smal).
l Computer System Interfa
ce) and the like, which are connected via a single-system input / output bus 150 that uses a general-purpose interface such as CE.

The magnetic disk recording / reproducing apparatus 100 is a magnetic disk 101 rotated by a disk rotating mechanism (not shown), and a magnetic disk for writing data to the magnetic disk 101 and reading data recorded on the magnetic disk 101. A head 102; a VCM mechanism 103 for moving the magnetic head 102;
A servo circuit section 104 for performing servo control for moving the magnetic head 102 to a desired track position via the CM mechanism 103, and a recording signal is generated based on recording data at the time of recording and supplied to the magnetic head 102.
At the time of reproduction, a read / write channel circuit unit 105 that generates and outputs reproduction data based on the reproduction signal read from the magnetic head 102, a hard disk controller unit 106 connected to the input / output bus 150, recording data and reproduction data. And a MPU (microprocessor unit) 108 for controlling the overall operation of the magnetic disk recording / reproducing apparatus 100.

MPU 108, hard disk controller 106, read / write channel circuit 105,
The servo circuit units 104 are connected to each other via the MPU bus 109.

The hard disk controller 106 is
When a command such as a reproduction request or a recording request is supplied from the host device 200 side via the input / output bus 150, a command such as a reproduction request or a recording request is supplied to the MPU 108 via the MPU bus 109.

When a reproduction request is supplied, the MPU 108
Writes the information necessary for the reproducing operation in the internal control register of the hard disk controller unit 106, writes the information necessary for the reproducing operation in the internal register of the read / write channel circuit unit 105, and further, the internal of the servo circuit unit 104. Information about the track number from which data is read is written in the register. The servo circuit unit 104 drives the VCM mechanism 103 based on the track number supplied from the MPU 108, and the magnetic head 1
02 is moved to the track position of the specified track number.

As a result, the recording data of the specified track number is read by the magnetic head 101, and the reproduction data is supplied to the hard disk controller section 106 via the read / write channel circuit section 105. The hard disk controller unit 106 stores the reproduction data supplied from the read / write channel circuit unit 105 in the buffer unit 1.
The reproduction data stored in the buffer unit 107 is supplied to the host device 200 based on the data transfer speed of the input / output bus 150.

When a recording request from the host device 200 side is supplied to the MPU 108 via the input / output bus 150 and the hard disk controller 106, the MPU 1
Reference numeral 08 denotes writing information necessary for a recording operation in an internal control register of the hard disk controller unit 106, writing information necessary for a recording operation in an internal register of the read / write channel circuit unit 105, and further writing information necessary for the recording operation in the servo circuit unit 104. Information about a track number for recording data is written in the internal register. The servo circuit unit 104 drives the VCM mechanism 103 based on the track number supplied from the MPU 108 to move the magnetic head 102 to the track position of the specified track number. This prepares for writing to the magnetic disk 101.

The hard disk controller 106 is
The recording data supplied from the host device 200 side via the input / output bus 150 is stored in the buffer unit 107, and the recording data stored in the buffer unit 107 is taken out based on the recording speed for the magnetic disk 101 and taken out. The recorded data is supplied to the read / write channel circuit unit 105. As a result, the read / write channel circuit unit 105 and the magnetic head 102.
Data is recorded on the magnetic disk 101 via the.

[0011]

As described above, the conventional magnetic disk recording / reproducing apparatus 100 and host device 20 are used.
Since 0 and 0 are connected via one-system input / output bus 150, it is necessary to perform the recording operation and the reproducing operation independently. In the command given from the host device 200 to the magnetic disk recording / reproducing apparatus 100, the recording operation and the reproducing operation are independently defined, and
The MPU 108 in the magnetic disk recording / reproducing apparatus 100 is
It only provided a single disk sequencer.

For this reason, the conventional magnetic disk recording / reproducing apparatus 100 could not perform the recording operation and the reproducing operation in parallel. For example, data compressed images
In a disk recording / reproducing apparatus for recording audio data, there is a demand to reproduce previously recorded image / audio data during recording of image / audio data. If there is one input / output bus 150 between the two, even if this one input / output bus 150 is used in a time-division manner, a large amount of continuous data such as images and audio is processed due to the time constraint required for data transfer. It was difficult to do.

Further, since recording and reproduction are defined as independent commands, in order to switch recording and reproduction alternately, commands are exchanged between the host device 200 and the magnetic disk recording / reproducing apparatus 100. It has to be performed frequently, and it has been practically impossible to record and reproduce a large amount of continuous data such as images and sounds at the same time.

The present invention has been made to solve the above problems, and an object thereof is to provide a disc recording / reproducing apparatus capable of reproducing data such as images and voices while recording the data.

[0015]

In order to solve the above-mentioned problems, a disk recording / reproducing apparatus according to the present invention is provided with a data input terminal for inputting data to be recorded on a disk, and for outputting data read from the disk. And a data output terminal.

Since the data input terminal and the data output terminal are independently provided, the recording operation and the reproducing operation can be performed at the same time.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of a disc recording / reproducing apparatus 1 according to the present invention. In FIG. 1, a magnetic disk recording / reproducing apparatus 1 is illustrated as a disk recording / reproducing apparatus, and the connection with a host device 50 is also shown.

The magnetic disk recording / reproducing apparatus 1 is for inputting data to be recorded on the magnetic disk 11, and a data input terminal 2 for outputting data read from the magnetic disk 11 independent of the data input terminal 2. And a data output terminal 3.

The magnetic disk recording / reproducing apparatus 1 includes a magnetic disk 1 rotated by a disk rotating mechanism (not shown).
1, a magnetic head 12 that writes data to the magnetic disk 11 and reads data recorded on the magnetic disk 11, and the magnetic head 1
A VCM mechanism 13 for moving 2 is provided. Also,
The magnetic disk recording / reproducing apparatus 1 generates a recording signal based on the recording data at the time of recording, and a servo circuit section 14 that performs servo control for moving the magnetic head 12 to a desired track position via the VCM mechanism 13. A read / write channel circuit section 15 for supplying the magnetic head 12 and generating and outputting reproduction data based on the reproduction signal read from the magnetic head 12 during reproduction, and a hard disk controller section 16 are provided. further,
The magnetic disk recording / reproducing apparatus 1 includes a recording buffer unit 17A for temporarily storing recorded data and a reproducing buffer unit 17B for temporarily storing reproduced data.
The magnetic disk recording / reproducing apparatus 1 also includes an MPU (microprocessor unit) 18 for controlling the overall operation.

The MPU 18, the hard disk controller section 16, the read / write channel circuit section 15 and the servo circuit section 14 are connected to each other via an MPU bus 19.

The hard disk controller 16 has a command detecting function for judging whether the data supplied through the data input terminal 2 is recording data or command data. This hard disk controller section 6
When detecting command data, supplies the detected command data to the MPU 18 via the MPU bus 19. Further, the hard disk controller unit 6
When the MPU 18 receives the status data for notifying the host device 50 or the like of the operating state of the hard disk device 1, the received status data is supplied to the host device 50 or the like via the data output terminal 3.

The hard disk controller section 16 comprises a recording buffer controller 16A for controlling writing and reading to and from the recording buffer 17A, and a reproducing buffer controller 16B for controlling writing and reading to and from the reproducing buffer 17B.

The recording buffer controller 16A in the hard disk controller 6 stores the recording data supplied via the data input terminal 2 when the recording mode or the simultaneous recording / reproducing operation mode is designated by the MPU 18. Store in 17A. The recording buffer controller 16A reads the recording data stored in the recording buffer unit 17A at a data rate that is more than twice as high as the transfer rate of the data input through the input terminal 2, and reads and writes the channel circuit section. It is supplied to the magnetic disk 15 and written to the magnetic disk 11 via the magnetic head 12.

The reproduction buffer controller 16B in the hard disk controller section 6 is supplied with reproduction through the magnetic head 12 and the read / write channel circuit section 15 when the reproduction mode or the simultaneous recording / reproduction operation mode is designated by the MPU 18. The data is temporarily stored in the reproduction buffer unit 17B. The reproduction buffer controller 16B reads the reproduction data stored in the reproduction buffer unit 17B in accordance with the transfer speed of the data output via the output terminal 3, and supplies it to the host device 50 or the like via the output terminal 3. To do. Here, the data speed of the reproduction data read from the magnetic disk 11 is a little more than twice the data speed of the reproduction data output from the output terminal 3, as in the recording.

The MPU 18 independently has the function of a recording disk sequencer and the function of a reproducing disk sequencer. When the MPU 18 receives a command requesting the simultaneous recording / reproducing operation mode from the host device 50 or the like via the hard disk controller 16,
The recording operation and the reproducing operation are alternately performed in time division.

In FIG. 1, a host device 50 is shown including a main part configuration of a multimedia terminal device capable of handling an image / audio signal. Host device 5 shown in FIG.
0 is an MPEG encoder 51 that outputs compressed data obtained by compressing an image / audio input signal by the MPEG method, and MPE.
An MPEG decoder 52 that decodes compressed data compressed by the G method and outputs an image / audio output signal, a CPU 53 that controls the overall operation of the host device 50, and the CP
Command for sending various commands such as recording / reproducing / simultaneous recording / reproducing operation to the magnetic disk recording / reproducing apparatus 1 supplied from U53 via the CPU bus 54 to the magnetic disk recording / reproducing apparatus 1. The status detecting section 5 which detects the status data output from the sending section 55 and the magnetic disk recording / reproducing apparatus 1 and supplies the detected status data to the CPU 53 via the CPU bus 54.
6 is provided.

Here, if the speed of the compressed data compressed by the MPEG system is α megabits per second, the hard disk controller section 16 stores the recording data supplied at the data speed of α megabits per second in the recording buffer section 17A. At the same time, the data is read from the recording buffer unit 17A at a data rate of 2α + β bits per second and supplied to the read / write channel circuit unit 15. The β bit is set according to the switching time from the recording operation to the reproducing operation or from the reproducing operation to the recording operation. This switching time includes the magnetic head seek time until the magnetic head is moved to a predetermined track position. In addition, the hard disk controller unit 16 uses the magnetic disk 11
Playback data having a data rate of 2α + β bits per second read out from the magnetic head 12 and the read / write channel circuit unit 15 is stored in the playback buffer unit 17B, and is read from the playback buffer unit 17B by α every second.
The reproduction data is read at a data rate of megabit, and the read reproduction data is output via the data output terminal 3.

FIG. 2 shows the hard disk controller section 16
It is a block diagram showing a specific example. The hard disk controller 16 includes a recording buffer controller 16A, a reproduction buffer controller 16B, a host interface (I / F) controller 21, and an MP.
U interface (I / F) controller 22, disk controller 23, ECC controller 24,
A controller bus 25 interconnects the controllers 16A, 16B, and 21-24.

The host interface (I / F) controller 21 has a command judgment function for judging whether the data supplied from the data input terminal 2 is recording data or command data. Host interface (I /
F) When command data is supplied from the data input terminal 2, the controller 21 supplies the command data to the MPU 18 via the controller bus 25 and the MPU interface controller 22. The host interface (I / F) controller 21 has a data input terminal 2
When the recording data is supplied from the recording medium, the recording data is supplied to the recording buffer controller 16A.

The host interface (I / F) controller 21 is a reproduction buffer controller 16B.
The reproduced data supplied from the data output terminal 3 is supplied to the host device 50. Host interface (I /
F) The controller 21 supplies the status data supplied from the MPU 18 to the host device 50.

MPU interface controller 22
Supplies the command data output from the host interface controller 21 to the MPU 18 side. Also,
The status data output from the MPU 18 side is supplied to the host interface controller 21 via the controller bus 25. Further, the MPU interface controller 22 sends operation mode commands related to the recording operation, the reproducing operation, the simultaneous recording / reproducing operation, etc., supplied from the MPU 18, to the other controllers 16A, 16B, 21, 23.
Supply to 24.

The disk controller 23 converts the recording data supplied from the recording buffer controller 16A into
It is supplied to the read / write channel circuit section 15. The disk controller 23 also supplies the reproduction data output from the read / write channel circuit unit 15 to the reproduction buffer controller 16B.

In the simultaneous recording and reproducing operation mode, the MPU
When switching from the 18 side to the recording mode is designated, the recording buffer controller 16A causes the recording buffer unit 17 to
The recording data stored in A is read out and supplied to the disk controller 23. The disk controller 23 supplies the supplied recording data to the read / write channel circuit unit 15. In the simultaneous recording / playback operation mode, M
When the switching from the PU 18 side to the reproduction mode is designated, the disk controller 23 supplies the reproduction data supplied from the read / write channel circuit unit 15 to the reproduction buffer controller 16B. The reproduction buffer controller 16B stores the supplied reproduction data in the reproduction buffer unit 17B.

The recording buffer controller 16A comprises a write control unit for writing the recording data into the recording buffer unit 17A and a read control unit for reading out the recording data written in the recording buffer unit 17A. The recording buffer unit 17A can be simultaneously written and read.

Similarly, the reproduction buffer controller unit 1
6B includes a write control unit for writing the reproduction data in the reproduction buffer unit 17B and a read control unit for reading the reproduction data written in the reproduction buffer unit 17B. When written, it can be read simultaneously.

The disk controller 23 also supplies the reproduction data supplied from the read / write channel circuit section 15 to the ECC controller 24. EC
The C controller 24 checks whether or not the reproduced data has an error. If the reproduced data has an error, the C controller 24 performs error correction processing, and the corrected reproduced data is recorded on the recording buffer controller 16 via the controller bus 25.
Supply to A. The recording buffer controller 16A is
When the data block to be corrected and the correction data are supplied from the ECC controller 24, the recording data of the corresponding recording data storage address in the recording buffer unit 17A is updated.

Since the magnetic disk recording / reproducing apparatus 1 has the above-described configuration, the host device 50 side shown in FIG. 1 records, for example, the currently received television broadcast while recording the image / audio recorded in the past. When playing back or recording the image / sound captured by the TV camera while displaying the image currently captured on the monitor screen together with the previously recorded image on the composite or sub-screen. The following operations enable simultaneous recording and playback operations.

First, the CPU 53 on the host device 50 side
Based on the status data output from the magnetic disk recording / reproducing apparatus 1 side, the magnetic disk recording / reproducing apparatus 1
Is waiting for you.

Next, the CPU 53 on the host device 50 side
Supplies to the magnetic disk recording / reproducing apparatus 1 a command for designating the simultaneous recording / reproducing simultaneous operation mode and data such as a file name for specifying the data to be recorded and the data to be reproduced, via the command transmission unit 55. .

When the CPU 53 on the host device 50 side confirms that the status data indicating that the simultaneous recording / reproducing operation is ready is supplied from the magnetic disk recording / reproducing apparatus 1 side, it causes the MPEG encoder 51 and the MPEG decoder 52 to operate. Control to the operating state. This allows the image
It is possible to record an audio input signal and reproduce already recorded image / audio data at the same time.

FIG. 3 is a block diagram of another disk recording / reproducing apparatus 31 according to the present invention. The magnetic disk recording / reproducing apparatus 31 shown in FIG. 3 is used for inputting commands to the magnetic disk recording / reproducing apparatus 31 in addition to the data input terminal 2 and the data output terminal 3, and also for the status from the magnetic disk recording / reproducing apparatus 31. A control data input / output terminal 4 for supplying data to the outside and an interrupt signal input terminal 5 for inputting an interrupt request from the host device 60 or the like to the magnetic disk recording / reproducing apparatus 31 are provided.

The hard disk controller section 32 supplies the command data supplied from the host device 60 side via the command / status bus 8 connected to the control data input / output terminal 4 to the MPU 33 via the MPU bus 19. In addition, the hard disk controller 32
The status data supplied from the MPU 33 via the MPU bus 19 is configured to be supplied to the host device 60 side via the command / status bus 8.

The hard disk controller 32 stores the recording data input via the input data bus 6 connected to the data input terminal 2 in the recording buffer 17A and reads the recording data stored in the recording buffer 17A. And supplies it to the write / read channel circuit unit 15. The hard disk controller unit 32 stores the reproduction data output from the write / read channel circuit unit 15 in the reproduction buffer unit 17B, and outputs the reproduction data stored in the reproduction buffer unit 17B to the output data connected to the data output terminal 3. It is supplied to the host device 60 side via the bus 7. As described above, the recording operation, the reproducing operation, and the simultaneous recording / reproducing operation of the hard disk controller unit 32 are the same as those of the hard disk controller unit 16 shown in FIG.

When the interrupt signal is supplied from the host device 60 side through the interrupt signal input terminal 5, the MPU 33 is configured to stop all the operations such as the recording operation, the reproducing operation, and the simultaneous recording / reproducing operation. .

The command / status interface section 61 on the host device 60 side is the CPU 6 on the host device 60 side.
Command data output from the magnetic disk recording / reproducing device 3 via the command / status input / output bus 8.
The status data supplied from the magnetic disk recording / reproducing apparatus 31 side via the command / status input / output bus 8 is supplied to the CPU 62.

The interrupt signal generator 63 is used by the host device 6
When the operation of turning off the power source on the 0 side is performed, the interrupt signal 63a is generated, and the generated interrupt signal 63a is supplied to the magnetic disk recording / reproducing device 31 side through the interrupt signal line 9 and the interrupt signal input terminal 5. To do.

It should be noted that the CPU 62 disables recording, reproduction, or simultaneous recording / reproduction operations on the host device 60 side in a state in which a command relating to the end of recording, reproduction, or simultaneous recording / reproduction operations has not been output. If such an operation is performed (for example, the receiving channel is changed during recording of the television broadcast), the interrupt signal generating unit 63 is requested to generate the interrupt signal 63a, and the interrupt signal 6 is generated.
3a may be generated. In addition, the CPU 62
If it is necessary to forcibly terminate recording, reproduction, simultaneous recording / reproduction, etc. during the period in which status data is supplied via the command / status input / output bus 8, the interrupt signal generator 63 Interrupt signal 6
The interrupt signal 63a may be generated by giving a request for generating 3a.

Magnetic disk recording / reproducing apparatus 1 shown in FIG.
Is a configuration that receives input of recording data and command input from the host device 50 via the input data bus 6 connected to the data input terminal 2. For this reason, in the magnetic recording / reproducing apparatus 1, for example, when it is desired to shift from the recording operation state to the recording / reproducing simultaneous operation, the compressed data of the image / sound is continuously output from the MPEG encoder 51. In order to send such a command, it is necessary to suspend the supply of the compressed data of the image / sound which is the recording data. The magnetic disk recording / reproducing apparatus 1 is
This may interrupt the recording of images, sounds, etc. for a short time.

On the other hand, since the magnetic disk recording / reproducing apparatus 31 shown in FIG. 3 has the control data input / output terminal 4 of a system different from the data input terminal 2, the supply of the recording data should be interrupted. Instead, a new command can be given to the magnetic disk recording / reproducing device 31. Similarly, in the case of supplying status data such as the current operating state and the remaining recording capacity of the magnetic disk to the host device 60 from the magnetic disk recording / reproducing apparatus 31 side, a system different from the data output terminal 3 is used. Since the control data input / output terminal 4 is provided, the status data can be supplied to the host device 60 without interrupting the supply of the reproduction data.

Further, the hard disk controller 16 in the magnetic disk recording / reproducing apparatus 1 shown in FIG. 1 judges whether the data supplied from the data input terminal 2 is record data or command data, and the judgment is made. It is necessary to switch the data transfer destination based on the result. Similarly,
Since there are two types of data output from the data output terminal 3, reproduction data and status data, it is necessary to switch the reproduction data and status data. For this reason, the hardware configuration of the hard disk controller 16 or the control program must be complicated. On the other hand, in the magnetic disk recording / reproducing apparatus 31 shown in FIG.
Since the control data input / output terminal 4 is exclusively provided for command data input and status data output,
Command data input processing and status data output processing can be realized with a simple configuration.

Further, in the magnetic disk recording / reproducing apparatus 1 shown in FIG. 1, when inputting command data and outputting status data, it is necessary to suspend the supply of recording data or reproduction data.
In order not to seriously affect the image and sound due to interruption,
It is necessary to select the timing for interrupting the supply of recording data or reproduction data. On the other hand, since the magnetic disk recording / reproducing apparatus 31 shown in FIG. 3 is provided with the control data input / output terminal 4 of a system different from the data input terminal 2 and the data output terminal 3, it is necessary at any timing. Command data and status data can be input and output.

When the host device 60 is an audio / visual device such as a television device or an audio device, the power may be turned off during recording, reproduction, or simultaneous recording / reproduction operation. is there. In such a case, it is difficult for the host device 60 to supply a command from the CPU 62 via the command / status interface unit 61 to end recording, reproduction, simultaneous recording / reproduction operations, and the like. There is a possibility that reproduction or simultaneous recording / reproduction may continue. On the other hand, the host device 60 shown in FIG. 3 outputs the interrupt signal 83a for requesting the forced termination of various operations.
Based on the interrupt signal 83a supplied to the recording medium, the recording, reproducing, simultaneous recording / reproducing operations, etc. are stopped.

Further, the magnetic disk recording / reproducing apparatus 31 is
Even if the command / status bus 8 is being used to output status data, the interrupt signal 83a
It is also possible to stop recording, reproduction, simultaneous recording and reproduction operations, etc.

As described above, the magnetic disk recording / reproducing apparatus 31 shown in FIG. 3 is provided with the dedicated control data input / output terminal 4 for inputting command data and outputting status data. The configuration can be simplified. Further, the magnetic disk recording / reproducing apparatus 31 can efficiently input a recording stop command or a restart command during recording / reproduction of indefinite length data. In addition, the magnetic disk recording / reproducing device 31
Can send status data to the host device 60 side when necessary in the operating state.

The magnetic disk recording / reproducing apparatus 31 is
Although the command data is input and the status data is output via the hard disk controller 32, the MPU 33 may directly input the command data and output the status data without using the hard disk controller 32. Good.

Further, the above-mentioned disc recording / reproducing device 31
The magnetic disk recording / reproducing apparatus using the magnetic disk 11 has been described above, but the present invention can be applied to other disk recording / reproducing apparatuses such as a magneto-optical disk recording / reproducing apparatus using a magneto-optical disk.

[0057]

As described above, the disc recording / reproducing apparatus according to the present invention has the data input terminal for inputting the data to be recorded on the disc and the data output terminal for outputting the reproduction data read from the disc. Since each is provided, the recording operation and the reproducing operation can be performed at the same time.

Further, by providing a control data input / output terminal for inputting command data and outputting status data, various control data can be input / output without interrupting recording and reproducing operations.

Furthermore, by providing an interrupt signal input terminal, an interrupt signal is supplied to the disc recording / reproducing apparatus side when the power is turned off on the host device side, and the recording operation is safely terminated on the way. It is also possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of a disc recording / reproducing apparatus according to the present invention.

FIG. 2 is a block configuration diagram showing a specific example of a hard disk controller unit.

FIG. 3 is a block diagram of another disc recording / reproducing apparatus according to the present invention.

FIG. 4 is a block diagram of a conventional disc recording / reproducing apparatus.

[Explanation of symbols]

 1, 31 magnetic disk recording / reproducing apparatus 2 data input terminal 3 data output terminal 4 control data input / output terminal 5 interrupt signal input terminal 6 input data bus 7 output data bus 8 command / status bus 11 magnetic disk 12 magnetic head 15 read / write channel Circuit part 16,32 Hard disk controller part 16A Recording buffer controller 16B Reproduction buffer controller 17A Recording buffer part 17B Reproduction buffer part 18,33 MPU 50,60 Host device

Claims (8)

[Claims] 1. Recording of data on a disc and reproduction of data recorded on the disc can be simultaneously performed.
A disc recording / reproducing apparatus comprising: a data input terminal for inputting data to be recorded on a disc; and a data output terminal for outputting data read from the disc. 2. The disk recording / reproducing apparatus according to claim 1, wherein a recording disk sequencer and a reproducing disk sequencer are independently provided. 3. The disc recording / reproducing apparatus according to claim 1, wherein a recording buffer and a reproducing buffer are provided independently of each other. 4. A disk recording / reproducing apparatus according to claim 1, wherein a recording buffer controller and a reproducing buffer controller are independently provided. 5. The disc recording / reproducing apparatus according to claim 1, wherein a command is input using the data input terminal. 6. The disc recording / reproducing apparatus according to claim 1, wherein the status is output using the data output terminal. 7. The disk recording apparatus according to claim 1, further comprising a dedicated control data input / output terminal for inputting a command and outputting a status. 8. The disk recording apparatus according to claim 1, further comprising an interrupt signal input terminal.