JPH04114366A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To increase the processing speed by inhibiting recording in the last sector on the inner peripheral side or the first sector on the outer peripheral side on zone boundaries and switching the recording frequency in the last or first sector to continuously record and reproduce information on each zone boundary. CONSTITUTION:Header information is read by a data R/W part 5; and when address information indicating the last sector of the zone exists in header information of each sector, a frequency synthesizer 6 starts switching of the recording frequency on the zone boundary and terminates it in the first sector of the next zone. Next, an optical disk control part 3 commands the R/W part 5 through an input/output data control part 4 not to record data during the switching. Consequently, the head sector of the next zone is used as a data recording inhibition area to continuously record and reproduce data across two zones, and the processing time is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording and reproducing apparatus that records and reproduces information using an optical information recording medium such as an optical disk.

[Prior Art] Generally, as a method for recording information on a rotating recording medium such as an optical disk or a magneto-optical disk, there are two methods: CAV method, which records information on the recording medium at a constant angular velocity, and CAV method, which records information at a constant linear velocity.
There is an LV method. In the CAV method, recording is performed at a constant angular velocity, so the closer the recording medium is to the outer periphery, the lower the recording density becomes.Therefore, there is a difference in recording density between the inner and outer peripheries. There is a problem that the efficiency is low and the overall recording capacity is also reduced.On the other hand, in the CL and V methods, the linear velocity is constant, so the recording density is constant regardless of whether it is on the inner or outer circumference.However, if the sector not radial;
Alternatively, since the rotation speed varies depending on the recording position of the recording medium, it takes time for the rotation speed to reach the target value at the time of access. Therefore, it is necessary to wait until the number of rotations reaches the target value, resulting in a problem that the access time becomes long.

Therefore, for example, CAV
The MCAV method has been proposed, which combines the advantages of the CLV method and the CLV method. The MCAV method is a method in which a recording medium is divided into a plurality of zones, and recording is performed by lowering the rotational speed toward the outer circumference. Therefore, the decrease in recording density on the outer circumferential side, which was a drawback of the CAV method, can be improved, and the utilization efficiency of the recording medium can be improved. Also known as the same MCAV method is a method in which the rotational speed of the recording medium is kept constant and the recording/reproducing frequency is increased toward the outer circumference. Even with this method, the decrease in recording density on the outer peripheral side can be improved in exactly the same way.

[Problems to be Solved by the Invention] By the way, in this method of increasing the recording and reproducing frequency toward the outer circumference of the recording medium, it is necessary to switch the recording and reproducing frequency for each zone. Therefore, when recording and reproducing over two zones, it is necessary to switch to the frequency corresponding to the next zone before moving to the next zone. However, since switching the frequency requires time in the frequency control section, it is difficult to continuously record and reproduce data in two zones. Conventionally, when recording and reproducing data in multiple zones, the user waits for the recording medium to rotate once at the zone boundary, and then switches the frequency during that time.

The present invention has been made to solve these problems, and its purpose is to process data continuously without waiting for one rotation of the recording medium at the boundary of each zone when processing is performed across multiple zones. It is an object of the present invention to provide an information recording and reproducing device that can process information and thus greatly speeds up the processing.

[Means for Solving the Problems] In order to achieve the above object, a disk-shaped recording medium whose recording area is divided into a plurality of zones in the radial direction is rotated at a constant speed, and the recording frequency is adjusted corresponding to each zone. In an information recording and reproducing apparatus that records information by changing the recording frequency and increasing the recording frequency toward the outer zone, information is recorded in the last sector of the inner zone or the first sector of the outer zone between the boundaries of each zone. There is provided an information recording and reproducing device characterized in that it is provided with means for inhibiting recording, and means for switching the recording frequency of the means for generating the recording frequency in the last sector or the first sector to the frequency of a corresponding zone. Ru.

[Example] Hereinafter, examples of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the information recording/reproducing apparatus of the present invention.

In FIG. 1, numeral 1 is a post computer which is a higher-level control device, and numeral 2 is an information recording/reproducing device connected to this host computer l. The information recording and reproducing device 2 records recording data sent from the host computer 1 on a recording medium (not shown), or
The information in the sector specified by is reproduced and the data is transferred to the host computer 1. Further, as a recording medium, an optical disk is used in this embodiment as will be described in detail later.

The information recording and reproducing device 2 includes an optical disk control section 3 that controls each section within the device, and this control causes the optical disk to rotate at a constant speed. In other words, this embodiment is an MCAV type apparatus that rotates an optical disc at a constant speed and switches the recording frequency for each zone of the optical disc.

The optical disk control unit 3 also includes an input/output data control unit 4,
The input/output data controller 4 is connected to the frequency synthesizer 5 and controls input/output data based on instructions from the optical disk controller 3. Furthermore, the frequency synthesizer 6 is a circuit that generates a recording frequency corresponding to the zone of the optical disc,
The frequency switching is controlled by the optical disk control section 3. The data R/W unit 5 is an optical head unit for recording information on an optical disc or reproducing recorded information.

As shown in FIG. 2, the optical disc has a disc-like shape, and tracks are formed in a spiral shape from the center to the outer periphery. Further, the recording area of the optical disc is divided into zones N, N+1, . . . in the radial direction. ...Divided into multiple zones such as N+n, so-called MCAV
formatted in a format. This optical disk is controlled to rotate at a constant speed as described above, and information is recorded at a higher recording frequency in zones closer to the outer circumference.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG.

In FIG. 3, it is assumed that the host computer 1 first issues a command to record information, and several sectors of data to be recorded are transmitted. In response to this command, the optical disk control section 3 requests the input/output data control section 4 to record data, and sends the data. In response to this, the input/output data control unit 4 outputs the data R.
/W unit 5 is commanded to read the header information of each sector of the optical disc. As a result, the data R/W unit 5 outputs S(
In step) 1, the ladder information is read and notified to the optical disk control section 3. Then, if address information indicating the final sector of the zone is found in the header information for each sector that is sent one after another in S2, the process advances to 83. Also, if the header information is not the final sector, 1 in S4.
Data is recorded for each sector, and after confirming that all data has been recorded in S7, the recording process is ended.

In S3, data for one sector is recorded in the final sector, and then the process advances to S5. At this time, the optical disc control section 3 instructs the frequency synthesizer 6 to switch to the recording frequency corresponding to the next zone. That is, as shown in FIG. 4, when the final sector of zone N is detected, the optical disk control section 3 records data in the final sector and then instructs the frequency synthesizer 6 to switch the recording frequency. As a result, the frequency synthesizer 6 starts switching the recording frequency at the end of the last sector, that is, at the zone boundary 7, and ends switching the frequency in the middle of the first sector of the next zone. Next, in S6, the optical disk control section 3 instructs the data R/W section 5 via the input/output data control section 4 not to record data during this frequency switching. Therefore, the first sector of the next zone is a data recording prohibited area. In this case, in this example, data recording and reproduction are managed on a sector-by-sector basis, so data is not recorded in all areas of the first sector.

After this, check whether all data has been recorded in S7,
If data remains, the process returns to Sl and reads the header information. In this case, the first sector has passed,
The header information read here is the header information of the second sector of the next zone. Therefore, since it is not the final sector in S2, the process advances to S4 and data recording is resumed from the second sector. Then, in S7, it is confirmed that recording of all data has been completed, and the recording process is terminated.

FIG. 5 shows the operation of another embodiment. In this embodiment, as shown in the figure (the sector immediately before the final sector of zone N is detected and the recording frequency is switched at the final sector), the final sector becomes a data recording prohibited area. The recording of data is restarted from the first sector of the next zone N+1.

[Effects of the Invention] As explained above, according to the present invention, the last sector on the inner side of the zone boundary or the first sector on the outer side is set as a data recording prohibited area, and the recording frequency is set in this last sector or the first sector. Since the switching is made, when data is recorded over two zones, recording and reproduction can be performed continuously without waiting for rotation of the recording medium.

Therefore, when recording and reproducing over a plurality of zones, the processing time can be significantly shortened compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the information recording and reproducing apparatus of the present invention, FIG. 2 is an explanatory diagram schematically showing an optical disc formatted in the MCAV format, and FIG. 3 shows the operation of the embodiment. Flowchart, FIG. 4 is an explanatory diagram showing the switching timing of the recording frequency, and FIG. 5 is an explanatory diagram showing the switching timing of the recording frequency in another example. 1: host computer, 2: information recording/reproducing device, 3:
Optical disk control unit, 4: Input/output data control unit, IZA: Data R/W unit, : Frequency synthesizer

Claims (1)

[Scope of Claims] A disk-shaped recording medium whose recording area is divided into a plurality of zones in the radial direction is rotated at a constant speed, and the recording frequency is changed corresponding to each zone, so that the outermost zones are more likely to be recorded. In an information recording and reproducing apparatus that records information at a high frequency, the present invention includes means for prohibiting recording of information in the last sector of the inner zone or the first sector of the outer zone between the boundaries of each zone; 1. An information recording and reproducing apparatus comprising: means for switching the recording frequency of the means for generating the recording frequency within a sector or a leading sector to a frequency of a corresponding zone.