JP2000187938A - Information recording/reproducing device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive information recording/reproducing device provided with storage capacity and data transfer rate necessary and sufficient for recording/reproducing a dynamic image data, etc. SOLUTION: When the data transfer speeds of magnetic disk devices 2A, 2B, 2C are higher than the data transfer rate of the recording data inputted from the outside through a data bus 20, the recording data are recorded on the magnetic disk devices 2A, 2B, 2C of a low data transfer rate. On the other hand, the data transfer rates of the magnetic disk devices 2A, 2B, 2C are lower than the data transfer speed of the recording data inputted from the outside, the recording data are recorded on the magnetic disk device 1 of a high data transfer rate. Further, when the data to be reproduced are recorded on the magnetic disk device 1, the data are reproduced from the magnetic disk device 1, and when the data to be reproduced are not recorded on the magnetic disk device 1, the data are reproduced from the magnetic disk devices 2A, 2B, 2C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus and method for storing video digital data such as moving image data and reproducing the stored data.

[0002]

2. Description of the Related Art As a device for storing and reproducing video digital data such as moving image data, a digital VTR device, a DVD (Digital Video Disc), and the like are known.
And an optical disk device represented by a CD-ROM, a magnetic disk device (also referred to as an HDD), and the like. These may be used alone or in combination of two or more. As a storage device combining a plurality of devices, for example, a combination of devices of the same type, such as a disk array constituted by a plurality of HDDs, and a VT
R and magnetic disk device, or optical disk device and HD
As described in D, there is a combination of different types of devices. When an HDD is combined with another storage device, such as an optical disk device and an HDD, the HDD generally serves as a data cache or buffer to increase the effective data transfer speed or to smoothly edit moving image data. Used to make it possible. Also, HD
There is also an HDD configured to increase the data transfer speed of the HDD by combining D with a semiconductor memory.

[0003] The data transfer speed of an HDD generally depends on the area on the magnetic disk that constitutes the HDD in which data is to be recorded, and the data transfer speed on the outer peripheral side of the magnetic disk is larger than that on the inner peripheral side of the magnetic disk. Transfer speed is high. Since data may be recorded on the outer peripheral side or on the inner peripheral side of the magnetic disk, when recording moving image data on the HDD, it is sufficient to record the moving image data on the inner peripheral side of the magnetic disk. It is necessary to use an HDD capable of obtaining a transfer speed.

[0004]

A digital VTR device cannot perform random access to data and takes a long time to access arbitrary data. Therefore, it is difficult to use the digital VTR device as a main storage device when editing moving image data. difficult.
On the other hand, the optical disk device can access data at a higher speed than the digital VTR device, but the access speed is much slower than that of the HDD. Therefore, the editing of the moving image data can be performed smoothly by using the optical disk device as a main storage device of the moving image data. Is difficult to do. Therefore, among these apparatuses, the HDD is most suitable for the main storage device of the moving image data. However, the HDD having a particularly high data transfer speed in terms of a large amount of moving image data and a required transfer speed is used. Must be used. However, an HDD having a high data transfer rate and a large capacity is expensive, and it is generally not practical to connect and use a plurality of such special HDDs in order to handle moving image data having a large data amount. In addition, although it is possible to use a semiconductor memory as a cache or a buffer to increase the speed,
When handling moving image data, the storage capacity of the semiconductor memory must be increased due to the large amount of data, and the cost per bit of the semiconductor memory is high, resulting in an extremely expensive device.

As a technique for increasing the effective transfer rate of an HDD, Japanese Patent Application Laid-Open No. 9-186,963 discloses a technique for controlling a recording area on an HDD according to a data transfer rate. Japanese Patent Application Laid-Open No. 9-70013 discloses a technique for preferentially recording frequently accessed ("hottest") video data on the outer peripheral side of an HDD to increase the speed. However, it is difficult to configure an HDD that can be used as a main storage device for moving image data using only these techniques.

An object of the present invention is to provide an inexpensive information recording / reproducing apparatus and an information recording / reproducing method having a sufficient storage capacity and a data transfer rate for recording and reproducing video digital data such as moving image data. Is to do.

[0007]

According to the present invention, there is provided an information recording / reproducing apparatus provided with a plurality of magnetic disk devices, wherein at least one of the devices has a high data transfer speed.
One first magnetic disk device and at least one second magnetic disk device having a lower data transfer speed than the first magnetic disk device.
Magnetic disk device, first speed detecting means for detecting a data transfer speed of recording data input from the outside, and second speed detecting means for detecting the data transfer speed of the second magnetic disk device The data transfer rate of the second magnetic disk device detected by the second speed detection means is higher than the data transfer rate of the externally input recording data detected by the first speed detection means. In the case, the recording data is recorded on the second magnetic disk device, and the data transfer speed of the second magnetic disk device is lower than the data transfer speed of the recording data input from the outside. Is a data recording control means for recording the recording data on the first magnetic disk device, and data to be reproduced is recorded on the first magnetic disk device. If the data to be reproduced is not recorded on the first magnetic disk device, the data is reproduced from the second magnetic disk device. Control means.

Further, the present invention provides at least one first magnetic disk device having a high data transfer speed, and at least one second magnetic disk device having a lower data transfer speed than the first magnetic disk device. And a method for recording / reproducing information with an information recording / reproducing apparatus comprising: a first method for detecting a data transfer rate of recording data input from the outside;
A speed detection step, and a second speed detection step of detecting a data transfer speed of the second magnetic disk device;
When the data transfer speed of the second magnetic disk device detected in the second speed detection step is higher than the data transfer speed of the externally input recording data detected in the first speed detection step Records the recording data on the second magnetic disk device,
A data recording control step of recording the recording data to the first magnetic disk device when the data transfer speed of the magnetic disk device is lower than the data transfer speed of the recording data input from the outside; When data to be reproduced is recorded on the first magnetic disk device, data is reproduced from the first magnetic disk device, and when data to be reproduced is not recorded on the first magnetic disk device And a data reproduction control step of reproducing data from the second magnetic disk device.

According to the present invention, when the data transfer speed of the second magnetic disk device is higher than the data transfer speed of the record data input from the outside, the record data is recorded on the second magnetic disk device. If the data transfer speed of the magnetic disk device is lower than the data transfer speed of the recording data input from the outside, the recording data is recorded on the first magnetic disk device. When the data to be reproduced is recorded on the first magnetic disk device, the data is reproduced from the first magnetic disk device, and when the data to be reproduced is not recorded on the first magnetic disk device. Has a second
The data is reproduced from the magnetic disk device.

Therefore, if data having a high data transfer rate is recorded on the first magnetic disk drive and then transferred to the second magnetic disk drive as described above, the magnetic disk drive having a low data transfer speed can be used. Can increase the average data transfer rate compared to using only
Moreover, a large-capacity information recording / reproducing apparatus can be realized at low cost. Also, at the time of data reproduction, the data is reproduced preferentially from the high-speed first magnetic disk device, so that the average data transfer speed can be increased also at the time of data reproduction. As a result, it is possible to configure an inexpensive information recording / reproducing apparatus having a sufficient storage capacity and a data transfer rate necessary for recording and reproducing video digital data such as moving image data.

Further, the present invention provides at least one magnetic disk and a first disk for accessing the magnetic disk.
And a second magnetic head, first and second arms respectively supporting the first and second magnetic heads,
First and second drive means for driving the first and second arms, respectively, and the first and second magnetic heads are controlled on the magnetic disk by controlling the first and second drive means, respectively. And a second control circuit for moving the first magnetic head in a region on the outer peripheral side of the magnetic disk, wherein the second control circuit The second magnetic head is moved in a region on the inner peripheral side of the magnetic disk.

Further, the present invention provides at least one magnetic disk and a first magnetic disk for accessing the magnetic disk.
And a second magnetic head, first and second arms respectively supporting the first and second magnetic heads,
First and second drive means for driving the first and second arms, respectively, and the first and second magnetic heads are controlled on the magnetic disk by controlling the first and second drive means, respectively. And a second control circuit for moving the first magnetic head in a region on the outer peripheral side of the magnetic disk, wherein the second control circuit A method for recording and reproducing information with an information recording / reproducing apparatus in which the second magnetic head is moved in an inner peripheral area of the magnetic disk, wherein a data transfer speed of recording data input from outside is detected. A first speed detecting step, a second speed detecting step for detecting the data transfer speed when the magnetic disk is accessed by the second magnetic head, and the second speed detecting step When the detected data transfer speed is higher than the data transfer speed detected in the first speed detection step, the second control circuit is controlled to transfer the recording data to the magnetic head through the second magnetic head. Recording on a disk, and controlling the first control circuit when the data transfer speed detected in the second speed detection step is lower than the data transfer speed detected in the first speed detection step. A data recording control step of recording the recording data on the magnetic disk through the first magnetic head; and a first control when data to be reproduced is recorded in the outer peripheral area of the magnetic disk. A circuit is controlled to reproduce data through the first magnetic head. If data to be reproduced is not recorded in the outer peripheral area of the magnetic head, It is characterized in that a data reproduction controlling step for reproducing data through the second control said circuit control to the second magnetic head.

According to the present invention, when the data transfer speed when the second magnetic head is used is higher than the data transfer speed of data inputted from the outside, the inner peripheral side of the magnetic disk is passed through the second magnetic head. On the other hand, when the data transfer speed when the second magnetic head is used is lower than the data transfer speed of data input from the outside, the data is recorded in the area of the magnetic disk through the first magnetic head. Data is recorded in the outer peripheral area. If the data to be reproduced is recorded in the outer peripheral area of the magnetic disk, the data is reproduced through the first magnetic head, and the data to be reproduced is not recorded in the outer peripheral area of the magnetic head. In this case, data is reproduced from the inner peripheral area of the magnetic disk through the second magnetic head.

Therefore, if data having a high data transfer speed is recorded in the outer peripheral area of the magnetic disk and then transferred to the inner area as described above, one magnetic disk can be accessed by one magnetic head. The average data transfer speed can be higher than in the case of using a hard disk drive, and a magnetic disk device having a normal data transfer speed can be used. realizable. Also, at the time of data reproduction, data is reproduced at a high data transfer speed preferentially through the first magnetic disk, so that the average data transfer speed can be increased also at the time of data reproduction. As a result, it is possible to configure an inexpensive information recording / reproducing apparatus having a sufficient storage capacity and a data transfer rate necessary for recording and reproducing video digital data such as moving image data. Furthermore, MR / I
When a D composite head is used, the deviation of the magnetic center position during recording and reproduction can be individually corrected in the respective storage areas on the outer peripheral side and the inner peripheral side of the magnetic disk, thereby reducing the amount of micro jog after correction. It is possible to do.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of the information recording / reproducing apparatus according to the present invention, FIG. 2 is a flowchart showing the operation of the information recording / reproducing apparatus shown in FIG. 1 when recording data, and FIG. 6 is a flowchart showing an operation of the apparatus when reproducing data. Hereinafter, an example of the information recording / reproducing apparatus of the present invention will be described with reference to these drawings, and at the same time, an embodiment of the information recording / reproducing method of the present invention will be described.

As shown in FIG. 1, the information recording / reproducing apparatus 30 of the embodiment includes one magnetic disk device 1 having a higher data transfer speed and three magnetic disk devices 1 having a lower data transfer speed than the magnetic disk device 1. Magnetic disk drives 2A, 2B, 2C
And the data distribution control means 10, and the magnetic disk device 1 is used as a temporary recording device.
The magnetic disk devices 2A, 2B, 2C are used as main recording devices. The information recording / reproducing device 30 is connected to another external system via an external data bus 20, and video digital data such as moving image data is stored in the information recording / reproducing device 30 via the external data bus 20.
Necessary data is extracted from the information recording / reproducing device 30. A magnetic disk device 1 and a magnetic disk device 2A,
Reference numerals 2B and 2C denote ordinary magnetic disk devices, each having an interface for receiving and transmitting data. Therefore, each of them can operate alone as a magnetic disk device.

The magnetic disk drive 1 has a very high data transfer speed and a high price.
On the other hand, the magnetic disk devices 2A, 2B, and 2C are magnetic disk devices having a low data transfer speed, a large recording capacity, and a low price. Here, the expression that the data transfer speed is high is used to indicate that data can be recorded at high speed to the magnetic disk device and that data can be retrieved from the magnetic disk device at high speed. Therefore, a magnetic disk device having a high data transfer speed means that, for example, not only data read from a magnetic disk can be simply transferred at high speed, but also a magnetic disk device capable of accessing magnetic disk at high speed and extracting data from magnetic disk itself at high speed. This means that it is a disk device. The same applies to the case where data is recorded on a magnetic disk device.

More specifically, the data distribution control means 10 includes a first speed detection means 10A for detecting a data transfer rate of recording data input from the outside, for example, from a frequency of a clock synchronized with the recording data, and a magnetic disk drive. 2A,
A second speed detecting unit 10B for detecting the data transfer speed of the magnetic disk drive 2B, 2C based on, for example, a seek position in the magnetic disk devices 2A, 2B, 2C. 10D.

Then, the data recording control means 10C operates the magnetic disk drive 2 detected by the second speed detecting means 10B.
If the data transfer rates of A, 2B, and 2C are higher than the data transfer rate of the externally input recording data detected by the first speed detecting means 10A, the recording data is recorded on the magnetic disk devices 2A, 2B, and 2C. And the magnetic disk drive 2
When the data transfer rates of A, 2B, and 2C are lower than the data transfer rate of the recording data input from the outside, the recording data is recorded on the magnetic disk device 1.

When recording data on the magnetic disk drive 1, the data recording control means 10C controls the magnetic disk drive of the magnetic disk drive 1 regardless of whether other data has already been recorded on the magnetic disk drive 1. The recording of data is started from the outermost recording area of. Further, when data is recorded on the magnetic disk device 1, the data recording control means 10C reproduces the recorded data from the magnetic disk device 1 after recording all the data and sends the data to the magnetic disk devices 2A, 2B, 2C. Record. On the other hand, if the data to be reproduced is recorded on the magnetic disk device 1, the data reproduction control means 10D
From the disk drive, and if the data to be reproduced is not recorded on the magnetic disk drive 1, the magnetic disk drive 2
Data is reproduced from A, 2B and 2C.

Next, the operation of the information recording / reproducing apparatus 1 configured as described above will be described. First, the operation at the time of data recording will be described with reference to the flowchart of FIG. Data to be recorded in the information recording / reproducing apparatus 1 is input to the data distribution control means 10 via the external data bus 20. Immediately after the information recording / reproducing apparatus 1 is started, the data distribution control means 10 sends all data input from the external data bus 20 to the magnetic disk device 2A as the main recording device.
(Or the magnetic disk devices 2B, 2C) (Yes in step S1), but is always a magnetic disk device as a temporary recording device based on the speed detection results of the first and second speed detecting means 10A, 10B. 1 or one of the magnetic disk devices 2A, 2B and 2C.

First and second data distribution control means 10
The speed detecting means 10A and 10B constantly monitor the transfer speed of the input data and the data transfer speed of the magnetic disk device to be recorded (steps S2 and S3). The data recording control means 10C operates on the basis of the speed detection results by the first and second speed detection means 10A, 10B, and operates the magnetic disk devices 2A, 2B, 2C detected by the second speed detection means 10B. If the data transfer speed Vw is higher than the data transfer speed VIN of the recording data input from the outside detected by the first speed detecting means 10A (No in step S4), the recording data is transferred to the magnetic disk device 2A,
2B and 2C (step S5). Conversely, when the data transfer speed of the magnetic disk devices 2A, 2B and 2C is lower than the data transfer speed of the recording data input from the outside (Yes in step S4). The recording data is recorded on the magnetic disk device 1 (step S6).

For example, when data is first recorded on the magnetic disk device 2A and the data transfer speed of the magnetic disk device 2A continues to be higher than the data transfer speed of external data, the data recording control means 10C Then, the magnetic disk device 1 does not access, and continues to record data as it is on the magnetic disk device 2A. However, for example, when the inner peripheral side of the magnetic disk is accessed in the magnetic disk device 2A, and the data transfer speed of the magnetic disk device 2A is reduced and becomes lower than the data transfer speed of external data. Records external data on the magnetic disk device 1.

At this time, in order to secure the highest possible data transfer rate, the area on the outermost side of the magnetic disk where the data transfer rate is high, regardless of whether data is already recorded on the magnetic disk of the magnetic disk drive 1 or not. Data is recorded in order from to the inner circumference. When the recording of all data is completed (Yes in step S7), the data recording control unit 10C, when recording data on the magnetic disk device 1 (Yes in step S8), stores the data recorded on the magnetic disk device 1. Are reproduced from the magnetic disk drive 1 and the magnetic disk drive 2A (or 2
B, 2C). The data transfer at this time is performed not via the external data bus 20 but via a data bus (not shown) in the data distribution control means 10 (step S9,
S10). The reason why the internal data bus is used in this way is to maintain the data transfer speed of the other device at a high level so as not to hinder other devices using the external data bus 20.

Next, the operation at the time of data reproduction will be described with reference to FIG. In this case, the data distribution control means 10
The data reproduction control means 10D starts operation in response to an external data request, and first checks whether there is data to be accessed and reproduced from the magnetic disk device 1 (step S101). If data exists, all the data is reproduced from the magnetic disk device 1 (steps S102 and S103).

Thereafter, the data reproduction control means 10D checks whether or not all the requested data has been reproduced (step S104). If the result is negative, the process returns to step S101. In this case, the result of the determination in step S101 is No.
Then, the process proceeds to step S5, where the magnetic disk device 2A and the magnetic disk devices 2B and 2C are accessed to reproduce the remaining data (steps S105 and S106). If no data exists in the magnetic disk device 1 in the investigation immediately after the start of the operation (No in step S101), the magnetic disk device 2A (or the magnetic disk device 2B,
C) is accessed to reproduce data.

As described above, in the information recording / reproducing apparatus 1 of the present embodiment, data is transferred via the magnetic disk device 1 having a high data transfer speed during both data recording and reproduction. The average data transfer speed can be made higher than when only the low-speed magnetic disk devices 2A and 2B and 2C are used.

Further, the magnetic disk devices 2A, 2B, 2
Since C is inexpensive, the information recording / reproducing device 30 can be configured at low cost even if a large capacity is secured by using three units for storing moving image data. Further, since the magnetic disk device 1 is used for temporary storage, it does not need to have a large storage capacity. Therefore, even if the magnetic disk device 1 having a high data transfer speed is used, the cost is not significantly affected.

Next, a second embodiment of the present invention will be described. FIG. 4 is a plan view showing the periphery of a magnetic disk constituting the information recording / reproducing device of the second embodiment, FIG. 5 is a configuration diagram showing the entire second embodiment, and FIG. FIG. 3 is a configuration diagram illustrating a signal flow. FIGS. 7 and 8 are flowcharts showing the operation of the second embodiment. Hereinafter, another example of the information recording / reproducing apparatus of the present invention will be described with reference to these drawings, and at the same time, another embodiment of the information recording / reproducing method of the present invention will be described.

The information recording / reproducing apparatus 100 includes an outer magnetic head 101 and an inner magnetic head 102 on a magnetic disk 103. The outer magnetic head 101 scans only the data recording area 201 on the outer peripheral side of the magnetic disk 103. ,
The inner magnetic head 102 is configured to scan only the data recording area 200 on the inner circumference of the magnetic disk 103.
In the present embodiment, the outer peripheral area 201 is used for temporarily recording data, while the inner peripheral area 200 is used as a main data recording area.

The magnetic heads 101 and 102 are supported by arms 101A and 102A, respectively, and are movable on the magnetic disk 103 in a substantially radial direction. As shown in FIG. 5, the information recording / reproducing apparatus 100 of the present embodiment includes a plurality of magnetic disks 103, each of which is fixed to the output shaft of a spindle motor 107 at the center, and is driven to rotate by the spindle motor 107. You. Outer magnetic head 101 and inner magnetic head 10
2 are provided for each magnetic disk, and arms 101A and 102A supporting the magnetic heads are provided at their bases with an outer carriage 108 and an inner carriage 109.
, And can swing independently in a plane parallel to the magnetic disk 103.

The outer carriage 108 and the inner carriage 1
09 swings at an arbitrary swing angle by the outer peripheral voice coil motor 110 and the inner peripheral voice coil motor 111 (first and second driving means according to the present invention). As a result, the magnetic heads 101 and 102 are magnetically driven. It is positioned at any disc radius position on the disc. The driving of the outer peripheral voice coil motor 110 and the inner peripheral voice coil motor 111
Outer circumference VCM control circuit 104 and inner circumference VCM control circuit 1
05 respectively. The outer circumference VCM control circuit 104 and the inner circumference VCM control circuit 105 are further independently controlled by a positioning control circuit 106.

As shown in FIG. 6, the outer peripheral magnetic head 10
1 and the inner magnetic head 102 have an outer recording / reproducing amplifier 1
12A and an inner circumference recording / reproducing amplifier 112B are connected respectively. These are amplifiers for amplifying a reproduction signal from the magnetic head and for flowing a recording current to the magnetic head. Recording / playback signal driver circuits 113A, 113A, 1
13B decodes data to be recorded and encodes reproduced data. Recording / playback signal driver circuit 11
3A and 113B are connected to the data distribution control means 115 via the internal data bus 114, and the data distribution control means 1
Reference numeral 15 is connected to the external data bus 116.

The data distribution control means 115 is
A first speed detecting unit 115A for detecting a data transfer speed of recording data input from outside;
And a second speed detecting means 115B for detecting a data transfer speed when the magnetic disk 103 is accessed. The data distribution control means 115 further includes a data recording control means 115C and a data reproduction control means 115D.
When the data transfer rate detected by the second speed detection means 115B is higher than the data transfer rate detected by the first speed detection means 115A, the data recording control means 115C By controlling the peripheral VCM control circuit 105 (a second control circuit according to the present invention), the recording data is recorded on the magnetic disk 103 through the magnetic head 102, and the data transfer speed detected by the second speed detecting means 115B is changed to the second speed. When the speed is lower than the data transfer speed detected by the first speed detecting means 115A, the outer peripheral VCM control circuit 104 (the first control circuit according to the present invention) is controlled through the positioning control circuit 106 and the recording data is magnetically transmitted through the magnetic head 101. The information is recorded on the disk 103. Further, the data recording control unit 115 </ b> C
When recording data on the magnetic disk 103 through
Data recording is started from the outermost recording area of the magnetic disk 103 irrespective of whether or not other data is already recorded in the outer peripheral area 201.

Then, the data recording control means 115C
When data is recorded on the outer peripheral area of the magnetic disk 103 through the magnetic head 101, after all data is recorded, the data is recorded on the magnetic disk 103 through the magnetic head 101.
The recorded data is reproduced from the area 201 on the outer peripheral side of the magnetic disk 102 and recorded in the area 200 on the inner peripheral side of the magnetic disk 103 through the magnetic head 102.

On the other hand, the data reproduction control means 115D stores the data to be reproduced in the area 2 on the outer peripheral side of the magnetic disk 103.
01 is recorded in the positioning control circuit 106
The data is reproduced through the magnetic head 101 by controlling the outer peripheral VCM control circuit 104 through the magnetic disk 101. When the data to be reproduced is not recorded in the outer peripheral area 201 of the magnetic disk 103, the inner peripheral VCM is transmitted through the positioning control circuit 106.
The control circuit 105 is controlled to reproduce data through the magnetic head 102.

The data recording control means 115C receives recording data via the external data bus 116, and the data reproduction control means 115D outputs reproduced data to the external data bus 116. On the other hand, when recording data reproduced through the magnetic head 101 through the magnetic head 102, the data recording control means
4, the data is transferred to the magnetic head 102 side.

Next, the operation of the information recording / reproducing apparatus 100 of the present embodiment configured as described above will be described. First, the operation during data recording will be described with reference to FIG. Data to be recorded in the information recording / reproducing apparatus 100 is transmitted via the external data bus 116 to the data distribution control unit 11.
5 is input. Immediately after the information recording / reproducing apparatus 100 is started, the data distribution control means 115 controls the external data bus 1
16 is recorded in the inner recording area 200, which is the main recording area (Y in step S201).
es) Normally, the first and second speed detecting means 115
Based on the speed detection results of A and 115B, recording is performed in either the outer peripheral area 201, which is a temporary recording area, or the area 200.

The first and second speed detection means 115A and 115B of the data distribution control means 115 always monitor the transfer rate of the input data and the data transfer rate when accessing the area 200 (steps S202 and S20).
3). Then, the data recording control means 115C operates based on the speed detection results by the first and second speed detection means 115A and 115B, and the second speed detection means 11C.
If the data transfer speed detected by the first speed detecting means 115A is higher than the data transfer speed of the recording data input from the outside detected by the first speed detecting means 115A (N in step S204)
o) The recording data is transferred to the inner peripheral area 200 which is the main recording area.
(Step S205), and conversely, if the data transfer speed for recording in the area 200 is lower than the data transfer speed of the recording data input from the outside (Yes in step S204), the recording data is temporarily recorded. Data is recorded in the outer peripheral area 201 which is the area (step S20).
6).

For example, when data is first recorded in the area 200 and the data transfer rate for recording in the area 200 continues to be higher than the data transfer rate of external data, the data recording control means 115C , Area 201
Is not accessed, and the data is directly stored in the area 200 on the inner circumference side.
Continue to record. However, in the area 200, for example, an area closer to the center of the magnetic disk is accessed, and when the data transfer rate is reduced and becomes lower than the transfer rate of external data, the external Is recorded in the outer peripheral area 201. At this time, regardless of whether data has already been recorded in the area 201, data is recorded in order from the area with the highest data transfer speed on the outermost circumference side of the magnetic disk 103 to the inner circumference side.

Then, the data recording control means 115C
When the recording of all data is completed (step S207)
If the data is recorded in the area 201 (Yes in step S208), all the data recorded in the area 201 is reproduced from the area 201 and recorded in the area 200. The data transfer at this time is performed by the external data bus 11
6 and via the data bus 114 in the data distribution control means 115 (steps S209 and S210).
The reason for using the internal data bus 114 in this way is to maintain the data transfer speed of the other device at a high level so as not to hinder other devices using the external data bus 116. .

Next, the operation during data reproduction will be described with reference to FIG. In this case, the data distribution control means 11
The fifth data reproduction control means 115D starts operation in response to a data request from the outside, and first checks whether there is data to be accessed and reproduced in the outer peripheral area 201 (step S301). If data exists, all the data is reproduced from the area 201 (steps S302 and S303).

Thereafter, the data reproduction control means 115D
It is determined whether or not all the requested data has been reproduced (step S304). If the result is negative, the process returns to step S301. In this case, the determination result in step S301 is No.
Therefore, the data reproduction control means 115D
The process proceeds to 305, where the inner area 200 is accessed to reproduce the remaining data (steps S305 and S306).
Also, in the investigation immediately after the start of the operation, if there is no data in the area 201 on the outer peripheral side (N in step S301)
o), the data is reproduced by accessing the inner area 200 from the beginning.

As described above, in the information recording / reproducing apparatus 100 of this embodiment, data is transmitted and received via the outer peripheral area 201 having a high data transfer speed during both data recording and reproducing. As compared with the case where the entire storage area of the magnetic disk 103 is simply used, the average data transfer speed can be increased. As a result, an information recording / reproducing apparatus having a high data transfer rate and a large storage capacity can be realized by using an inexpensive magnetic disk apparatus having a large storage capacity. Further, the information recording / reproducing apparatus 100 has an advantage that the amount of micro jog when using the MR / ID combined head can be reduced. That is, as is well known, when an MR / ID combined head is used,
Due to the presence of the yaw angle, the magnetic center position at the time of recording and the magnetic center position at the time of reproduction do not match, and the magnitude of the deviation of the magnetic center position, that is, the amount of micro jog, depends on the magnitude of the yaw angle. The larger the angle, the larger the micro-jog amount.

In the magnetic disk drive using the MR / ID composite head, the correction is performed so that the micro-jog amount approaches 0. However, the larger the micro-jog amount, the larger the necessary correction amount. Becomes difficult. Further, as the recording track density is increased, the correction amount may be one or more tracks, and it becomes more difficult to perform complete correction.

The correction of the micro-jog amount is generally performed in advance so that the deviation of the magnetic center position due to the yaw angle is canceled at a middle position in the radial direction (track width direction) of the magnetic disk and the micro-jog amount becomes zero. This is performed by shifting the relative position of the MR head and the ID head in the track width direction. Therefore, although the micro-jog amount becomes small in the middle of the magnetic disk, the micro-jog amount is not sufficiently corrected at the inner and outer peripheral portions of the magnetic disk, and the micro-jog amount becomes a relatively large value. However, in the information recording / reproducing apparatus 100 of the present embodiment, the two magnetic heads 101 and 102 share the outer peripheral area 201 and the inner peripheral area 200 of the magnetic disk 103, respectively. , The width of each region in the radial direction is small, so that the micro-jog amount for each region is small, and correction is easy.

For example, when a 3.5-inch magnetic disk drive is considered, the write radius is about 20 mm to 44 mm.
It is. In a conventional magnetic disk drive, this radius range is set to 1
It is necessary to scan with two magnetic heads, but in the case of the information recording / reproducing apparatus 100, for example,
From 32mm to 44mm
mm, and so on. Therefore, the inner peripheral head has a radius of 26 m between the radius of 20 mm and the radius of 32 mm.
The outer peripheral side head can be designed so that the micro jog amount becomes zero at a position with a radius of 38 mm so that the micro jog amount becomes zero at the position of m. as a result,
The disk radius area covered by each magnetic head becomes narrower,
The magnitude of the yaw angle is reduced, and the amount of micro jog can be reduced.

That is, the information recording / reproducing apparatus 100 of the present embodiment has a sufficient storage capacity and data transfer speed for realizing recording and reproduction of video digital data such as moving image data, and can be configured at low cost. Not only that, it is advantageous in reducing the amount of micro jog.

[0049]

Next, an embodiment of the present invention will be described. First, an embodiment of the information recording / reproducing device 30 will be described.
The maximum transfer rate of the magnetic disk device 1 is 140
Mb / s, a magnetic disk device with a recording capacity of 2.1 GB, a magnetic disk device with a maximum transfer rate of 92 Mb / s and a recording capacity of 4.4 GB as magnetic disk devices 2A, 2B, and 2C, and a U as an external interface
The information recording / reproducing device 30 was manufactured using ltra ATA. The total recording capacity of this device 30 is 13.2 GB. Also, the above two types of magnetic disk devices are inexpensive because they are popular products. Further, since the magnetic disk device used as the magnetic disk device 1 is used as a temporary recording / reproducing device, the recording capacity may be relatively small, and therefore, this magnetic disk device can be obtained at low cost. For this reason, the entire apparatus has a large-capacity and inexpensive configuration.

The average data transfer rate of this apparatus was measured after recording MPEG2 data.
It was 7 Mb / s. Usually, the average transfer rate is about 50% of the maximum transfer rate. The value of about 77 Mb / s was 80% or more of the maximum transfer rate of the magnetic disk devices 2A, 2B, and 2C, and it was confirmed that the effect of the magnetic disk device according to the present invention was remarkable. As described above, an information recording / reproducing apparatus capable of recording / reproducing video digital data such as moving image data with excellent cost performance has been realized.

Next, an embodiment of the information recording / reproducing apparatus 100 will be described. As an example, the information recording / reproducing apparatus 100
The SCSI-2 is used for the external data bus 115 which configures the magnetic disk 103, and the rotational speed of the magnetic disk 103 is 5400 r.
As pm, a data transfer rate of 145 Mb / s was obtained at the outermost circumference, and a data transfer rate of 62 Mb / s was obtained at the innermost circumference.
Then, the storage area of the magnetic disk 103 was divided into data areas of 80 zones in the radial direction of the disk, and 40 zones from the inside were defined as a main recording area, and the outside as a temporary recording area. When the MPEG2 data was actually recorded and the average data transfer rate was measured, it was about 123 Mb / s. On the other hand, the average data transfer rate when data is recorded and reproduced with only one magnetic head is about 100 Mb / s.
Met. Therefore, in this embodiment, the data transfer rate could be improved by about 20%.

[0052]

As described above, according to the present invention, when the data transfer speed of the second magnetic disk device is higher than the data transfer speed of the recording data input from the outside, the recording data is transferred to the second magnetic disk device. The data is recorded on the device, and when the data transfer speed of the second magnetic disk device is lower than the data transfer speed of the record data input from the outside, the record data is recorded on the first magnetic disk device. If the data to be reproduced is recorded on the first magnetic disk device, the data is reproduced from the first magnetic disk device,
If the data to be reproduced is not recorded on the first magnetic disk device, the data is reproduced from the second magnetic disk device.

Therefore, if data having a high data transfer speed is recorded on the first magnetic disk device as described above and then transferred to the second magnetic disk device, the magnetic disk device having a low data transfer speed can be used. Can increase the average data transfer rate compared to using only
Moreover, a large-capacity information recording / reproducing apparatus can be realized at low cost. Also, at the time of data reproduction, the data is reproduced preferentially from the high-speed first magnetic disk device, so that the average data transfer speed can be increased also at the time of data reproduction. As a result, it is possible to configure an inexpensive information recording / reproducing apparatus having a sufficient storage capacity and a data transfer rate necessary for recording and reproducing video digital data such as moving image data.

Further, according to the present invention, when the data transfer speed when the second magnetic head is used is higher than the data transfer speed of data input from the outside, the data is transferred from the magnetic disk through the second magnetic head. On the other hand, data is recorded in the peripheral area, and conversely, when the data transfer speed when the second magnetic head is used is lower than the data transfer speed of data input from the outside, the magnetic data is passed through the first magnetic head. Data is recorded in the outer peripheral area of the disc. When the data to be reproduced is recorded in the outer peripheral area of the magnetic disk, the data is reproduced through the first magnetic head,
If the data to be reproduced is not recorded in the outer peripheral area of the magnetic head, the data is reproduced from the inner peripheral area of the magnetic disk through the second magnetic head.

Therefore, if data of a high data transfer speed is recorded in the outer peripheral area of the magnetic disk and then transferred to the inner area as described above, one magnetic disk can be accessed by one magnetic head. The average data transfer speed can be higher than in the case of using a hard disk drive, and a magnetic disk device having a normal data transfer speed can be used. realizable. Also, at the time of data reproduction, data is reproduced at a high data transfer speed preferentially through the first magnetic disk, so that the average data transfer speed can be increased also at the time of data reproduction. As a result, it is possible to configure an inexpensive information recording / reproducing apparatus having a sufficient storage capacity and a data transfer rate necessary for recording and reproducing video digital data such as moving image data. Furthermore, MR / I
When a D composite head is used, the deviation of the magnetic center position during recording and reproduction can be individually corrected in the respective storage areas on the outer peripheral side and the inner peripheral side of the magnetic disk, thereby reducing the amount of micro jog after correction. It is possible to do.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of an information recording / reproducing apparatus according to the present invention.

FIG. 2 is a flowchart showing an operation of the information recording / reproducing apparatus shown in FIG. 1 during data recording.

FIG. 3 is a flowchart showing an operation of the information recording / reproducing apparatus shown in FIG. 1 during data reproduction.

FIG. 4 is a plan view showing the periphery of a magnetic disk constituting an information recording / reproducing apparatus according to a second embodiment.

FIG. 5 is a configuration diagram illustrating the entirety of a second embodiment;

FIG. 6 is a configuration diagram of a second embodiment showing a signal flow particularly in FIG. 5;

FIG. 7 is a flowchart showing an operation at the time of data recording in the second embodiment.

FIG. 8 is a flowchart showing an operation at the time of data reproduction in the second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic disk device, 2A-2C ... Magnetic disk device, 10 ... Data distribution control means, 10A ... 1st speed detection means, 10B ... 2nd speed detection means, 10C
... data recording control means, 10D ... data reproduction control means, 20 ... external data bus, 30 ... information recording / reproduction device, 101 ... outer magnetic head, 102 ... inner magnetic head, 103 ... magnetic disk , 104 ... VCM
Control circuit, 105 ... Inner circumference VCM control circuit, 106 ...
Positioning control circuit, 107 ... Spindle motor, 10
8 ... Outer carriage, 109 ... Inner carriage, 1
00 information recording / reproducing device 110 outer voice coil motor 111 inner voice coil motor 112
A: outer peripheral recording / reproducing amplifier, 112B: inner peripheral recording / reproducing amplifier, 113: recording / reproducing signal driver circuit, 114
... internal data bus, 115 ... data distribution control means,
115A ... first speed detecting means, 115B ... second speed detecting means, 115C ... data recording control means, 11
5D: data reproduction control means, 116: external data bus, 200: main recording / reproducing area, 201: temporary recording / reproducing area.

Claims (17)

[Claims] 1. An information recording / reproducing apparatus including a plurality of magnetic disk devices, wherein at least one first magnetic disk device having a high data transfer speed has a data transfer speed higher than that of the first magnetic disk device. At least one low-speed second magnetic disk device, first speed detecting means for detecting a data transfer speed of recording data input from the outside, and detecting the data transfer speed of the second magnetic disk device A second speed detecting unit, wherein the data transfer speed of the second magnetic disk device detected by the second speed detecting unit is the recording data input from outside detected by the first speed detecting unit. If the data transfer speed is higher than the data transfer speed, the recording data is recorded on the second magnetic disk device, and the data transfer speed of the second magnetic disk device is Data recording control means for recording the recording data on the first magnetic disk device when the data transfer speed of the recording data input from the outside is lower than the data transfer speed; If the data is recorded on the first magnetic disk device, the data is reproduced from the first magnetic disk device. If the data to be reproduced is not recorded on the first magnetic disk device, the data is reproduced from the second magnetic disk device. An information recording / reproducing apparatus, comprising: data reproduction control means for reproducing the information. 2. The data recording control means, when recording data on the first magnetic disk device, regardless of whether or not other data has already been recorded on the first magnetic disk device. 2. The information recording / reproducing apparatus according to claim 1, wherein data recording is started from the outermost recording area of the magnetic disk of the first magnetic disk device. 3. When data is recorded on the first magnetic disk device, the data recording control means, after recording all data, sends the data from the first magnetic disk device.
2. The information recording and reproducing apparatus according to claim 1, wherein the recorded data is reproduced and recorded on the second magnetic disk device. 4. The data recording control means receives the recording data via an external data bus, and the data reproduction control means outputs reproduced data to the external data bus.
The data recording control means, when recording data reproduced from the first magnetic disk device on the second magnetic disk device, transmits the data through a data bus different from the external data bus to the second magnetic disk device. 4. The information recording / reproducing apparatus according to claim 3, wherein the information is transferred to a device. 5. At least one first magnetic disk device having a higher data transfer speed, and at least one second magnetic disk device having a lower data transfer speed than said first magnetic disk device.
A method for recording / reproducing information with an information recording / reproducing apparatus comprising: a first speed detecting step of detecting a data transfer rate of recording data inputted from the outside; A second speed detecting step for detecting a data transfer speed of the disk device, and the data transfer speed of the second magnetic disk device detected in the second speed detecting step is detected in the first speed detecting step. If the recording data input from the outside is higher than the data transfer rate, the recording data is recorded on the second magnetic disk device, and the second
A data recording control step of recording the recording data on the first magnetic disk device when the data transfer speed of the magnetic disk device is lower than the data transfer speed of the recording data input from the outside; When data to be reproduced is recorded on the first magnetic disk device, data is reproduced from the first magnetic disk device, and when data to be reproduced is not recorded on the first magnetic disk device A data reproduction control step of reproducing data from the second magnetic disk device. 6. In the data recording control step, when recording data on the first magnetic disk device, regardless of whether or not other data has already been recorded on the first magnetic disk device. 6. The information recording / reproducing method according to claim 5, wherein data recording is started from a recording area on the outermost circumference side of the magnetic disk of the first magnetic disk device. 7. In the data recording control step, when data is recorded on the first magnetic disk device, after recording all data, the recorded data is reproduced from the first magnetic disk device. 6. The information recording / reproducing method according to claim 5, wherein the information is recorded on the second magnetic disk device. 8. In the data recording control step, the recording data is received via an external data bus, and in the data reproduction control step, reproduced data is output to the external data bus. 8. The method according to claim 7, wherein when the data reproduced from the magnetic disk device is recorded on the second magnetic disk device, the data is transferred to the second magnetic disk device through a data bus different from the external data bus. Information recording and reproduction method described. 9. At least one magnetic disk, and first and second magnetic disks for accessing the magnetic disk
A magnetic head; first and second arms respectively supporting the first and second magnetic heads; first and second driving means for driving the first and second arms, respectively; First and second control circuits for controlling first and second driving means respectively to move the first and second magnetic heads on the magnetic disk, respectively, wherein the first control circuit comprises: Moving the first magnetic head in a region on the outer periphery of the magnetic disk, and the second control circuit moving the second magnetic head in a region on the inner periphery of the magnetic disk. Information recording and reproducing apparatus. 10. A first speed detecting means for detecting a data transfer speed of recording data inputted from the outside, and a second speed detecting means for detecting the data transfer speed when the magnetic disk is accessed by the second magnetic head. And controlling the second control circuit when the data transfer rate detected by the second speed detection means is higher than the data transfer rate detected by the first speed detection means. And recording the recording data on the magnetic disk through the second magnetic head, wherein the data transfer speed detected by the second speed detecting means is the data transfer speed detected by the first speed detecting means. A data recording control means for controlling the first control circuit to record the recording data on the magnetic disk through the first magnetic head, When the data to be recorded is recorded in the outer peripheral area of the magnetic disk, the first control circuit is controlled to reproduce the data through the first magnetic head, and the data to be reproduced is a magnetic head. And data reproduction control means for controlling the second control circuit to reproduce data through the second magnetic head when the data is not recorded in the outer peripheral area. 9. The information recording / reproducing apparatus according to item 9. 11. The data recording control means according to claim 1, wherein:
When data is recorded on the magnetic disk through the magnetic head, data is recorded from the outermost recording area of the magnetic disk regardless of whether other data is already recorded in the outermost area. The information recording / reproducing apparatus according to claim 10, wherein the information recording / reproducing apparatus starts. 12. The data recording control means according to claim 1, wherein:
When data is recorded in the outer peripheral area of the magnetic disk through the magnetic head, after recording all data, the recorded data is transmitted from the outer peripheral area of the magnetic disk through the first magnetic head. 11. The information recording / reproducing apparatus according to claim 10, wherein the information is reproduced and recorded in an inner peripheral area of the magnetic disk through the second magnetic head. 13. The data recording control means receives the recording data via an external data bus, the data reproduction control means outputs reproduced data to the external data bus, and the data recording control means comprises: 13. The information according to claim 12, wherein when recording data reproduced through the head through the second magnetic head, the data is transferred to the second magnetic head through a data bus different from the external data bus. Recording and playback device. 14. At least one magnetic disk, first and second magnetic heads for accessing said magnetic disk, and first and second magnetic heads respectively supporting said first and second magnetic heads. An arm, first and second driving means for driving the first and second arms, respectively, and controlling the first and second magnetic heads by controlling the first and second driving means, respectively. A first and a second control circuit for moving the magnetic head on the magnetic disk, wherein the first control circuit moves the first magnetic head in an outer peripheral area of the magnetic disk; The control circuit is a method for recording / reproducing information with an information recording / reproducing apparatus which moves the second magnetic head in an inner peripheral area of the magnetic disk, wherein the data recording / reproducing apparatus records data of externally input recording data. A first speed detecting step for detecting a transfer speed; a second speed detecting step for detecting the data transfer speed when the magnetic disk is accessed by the second magnetic head; and the second speed detecting step. If the data transfer speed detected in step (c) is higher than the data transfer speed detected in the first speed detection step, the second control circuit is controlled to transfer the recording data through the second magnetic head. When the data transfer speed recorded on the magnetic disk and detected in the second speed detection step is lower than the data transfer speed detected in the first speed detection step, the first control circuit is controlled. A data recording control step of recording the recording data on the magnetic disk through the first magnetic head; When the data is recorded in the outer peripheral area of the disk, the first control circuit is controlled to reproduce data through the first magnetic head, and the data to be reproduced is stored in the outer peripheral area of the magnetic head. A data reproduction control step of controlling the second control circuit to reproduce data through the second magnetic head when the data is not recorded in the data. 15. In the data recording control step, when data is recorded through the first magnetic head, irrespective of whether or not other data has already been recorded in the outermost peripheral area, 2. The information recording / reproducing apparatus according to claim 1, wherein data recording is started from the outermost recording area. 16. In the data recording control step, when data is recorded in the outer peripheral area of the magnetic disk through the first magnetic head, after recording all data, the data is passed through the first magnetic head. 15. The information recording / reproducing apparatus according to claim 14, wherein the recorded data is reproduced from the outer peripheral area of the magnetic disk and is recorded in the inner peripheral area of the magnetic disk through the second magnetic head. Method. 17. In the data recording control step, the recording data is received via an external data bus, and in the data reproduction control step, the reproduced data is output to the external data bus. 17. The information according to claim 16, wherein when data reproduced through the head is recorded through the second magnetic head, the data is transferred to the second magnetic head through a data bus different from the external data bus. Recording and playback method.