JPS62141677A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To shorten time for data transfer by storing data in a substitute track corresponding to a defective track in a substitute track buffer before reproducing data. CONSTITUTION:A CPU 1 examines the existence of a defective track in a reproduction area from substitute track control information stored beforehand in a substitute track control information storage memory 19 from an optical disk, and reproduces all data in a substitute track for a defective track, and stores in a substitute track buffer 16. When a light head 6 comes on the defec tive track during data reproduction, the light head reproduces data of the substi tute track corresponding to the defective track from the buffer memory 16 and transfers to a track buffer 2. Thereby, it becommes unnecessary to access an optical head to a substitute track area during reproduction of a series of recorded data.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an information recording/reproducing device.

[Prior Art] FIG. 3 is a diagram showing a general optical disc used in a conventional optical disc device.

This optical disc has a track start position SP and a sector S.
, header section, data section d, and alternative track area 5
The 0 alternative track area 50 containing 0 is used when a defect occurs on the optical disc.

Alternatively, it is an area that can be used as a substitute for a non-recordable area when recording in a track area is impossible.

FIG. 4 is a block diagram showing a conventional optical disk device.

:tS4 The process of reproducing information from an optical disc in a conventional optical disc device will be described with reference to FIG.

First, the optical disk device receives from the external interface 17 the start address of playback data and information on the amount of playback data. Based on the start address and information on the amount of data to be reproduced, the CPUI instructs the optical radar 6 to access a predetermined position. When the optical disc 6 is accessed at a predetermined position on the optical disk 16, it starts reproducing the recorded data. The signal read by the optical helad 6 is sent to the head amplifier lO1 waveform shaping circuit 12) digital demodulation circuit 13,
Errors are corrected in the ECC circuit 3.

If the recorded data is reproducible, the data is stored in the track buffer 1 memory 2. If a defective track exists during recording in an area where a series of data to be reproduced is recorded, one alternative track processing is performed, and the optical helad 6 accesses the alternative track area from the data recording area, and after reproducing the data, The data in the recording area is reproduced again.

The access time of the optical head 6 takes several tens of milliseconds to several hundred milliseconds. During a series of recorded data reproduction, when data from the first recording track 50 is reproduced, the optical head 6 is moved to -
Since the H1 alternative track area 50 is accessed, there is a problem that the data reproduction time increases. Especially when the amount of data is several megabytes or tens of megabytes, such as full-color image information.
When reproducing recorded data in the form of bytes, the optical head 6
There is a possibility that the user accesses the alternative track area 50 several times. In this case, there is a problem in that a time delay due to data reproduction from the alternative track area cannot be ignored.

[Object of the Invention] The present invention has been made by focusing on the problems in the conventional device described above, and provides an information recording and reproducing device that can eliminate delays in data reproduction time when reproducing data from an alternative track. The purpose is to provide the following.

[Embodiments of the invention] FIG. 1 is a block diagram showing one embodiment of the present invention.

Note that the same reference numerals are used for the same members as those shown in FIG. 4, and the description thereof will be omitted. Note that the above embodiment includes a digital modulation circuit 4, a laser drive circuit 5, a linear motor 7, a spindle motor 8, a spindle motor drive 18, an AT, a λF circuit 9. Linear motor drive 11
．． Address regeneration circuit 14. Sector recording readout determination circuit 1
5.

The embodiment shown in FIG. 1 differs from the conventional example shown in FIG. 4 in that it is provided with a 1 alternative track buffer 16 and an alternative track management information storage memory 19. It stores the reproduced information. Further, the alternative track management information storage memory 19 is a memory that stores management information of alternative tracks.

In the above embodiment, when reproducing a series of data, defective tracks in the reproduced data area are checked, and data recorded in alternative tracks corresponding to each defective track is stored in one alternative track buffer 19. And after storing it,
Data is reproduced from the optical disc 20.

During this data reproduction, when the optical disc 6 accesses the defective track 2, it searches for an alternative track corresponding to the defective track and reads the data stored in the alternative track buffer 16 corresponding to this alternative track. The reproduced data is then transferred to the track buffer 2. This eliminates the need for the optical radar 6 to access the alternative track area during a series of data reproduction, thereby shortening the data transfer time.

FIG. 2 is a diagram showing the configuration of an optical disc.

This optical disc 20 has an outer protected area 61, a data storage area 62, one alternative track area 63, an alternative track management table 64, an inner protected area 65, and a track I.
D6B and also has a defective track D.

Next, the operation of the above embodiment will be explained.

When the optical disc 20 is loaded into the optical disc device, the CP
The UI is an alternative track management table 64 on the optical disk.
0 commands to write the alternative track management information stored in the 1 alternative track management information storage memory 19.
The alternative track management information consists of 3 bytes, of which 2 bytes indicate the number of the defective track D, and the remaining 1 byte indicates relative alternative track position information in the alternative track area. .

When reproducing data recorded in the data recording area 62 of the optical disc 20, first, the start address of the data to be reproduced and information regarding the amount of continuous reproduction data are sent via the external interface 17. Here, the area to be reproduced is called reproduction area A. CPU based on the information sent
I checks the existence of a defective track D in the reproduction area A to be reproduced in the data recording area 62 from the alternative track management information stored in the alternative track management information storage memory 19.

If the defective track D does not exist in the reproduction area A to be reproduced, the CPU instructs the optical head 6 to access the start address of the reproduction data area, and reproduces the data.

If a defective track D exists in the reproduction area A to be reproduced,
The CPU causes the optical disc 6 to access the alternative track for the defective track D having the width of the alternative track area 63, reproduces the data recorded in the alternative track, and stores it in the alternative track buffer 16. After completing data reproduction of alternative tracks for all defective tracks included in the reproduction area A, the CPUI accesses the optical radar 6 to the start address of the reproduction area A and starts data reproduction.

During data reproduction, when the optical device 6 comes over a defective track D, it reproduces the data of the alternative track corresponding to the defective track from among the data stored in the alternative track buffer memory 16, and the reproduced data is transferred to track buffer 2. By doing so, there is no need for the optical head to access the alternative track area during a series of recorded data reproduction.

Although the above embodiments have been explained using an optical disk device as an example, the present invention can also be applied to information recording and reproducing devices such as magnetic disk devices, magneto-optical disk devices, and optical cards.

[Effects of the Invention] According to the present invention, when data is reproduced from an alternative track, a lag in the data reproduction time can be removed and the actual reproduction time can be shortened.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the unreleased II. FIG. 2 is a diagram showing the configuration of an optical disc. Figure fjS3 is a diagram showing a general configuration of an optical disc. FIG. 4 is a block diagram showing a conventional magneto-optical disk device. 6... Optical head, 16... Alternative track buffer. 19...Alternative track management information storage memory. Figure 2 ± insect 4 = , 30' 7 Figure 3

Claims (4)

[Claims] (1) In an information recording and reproducing apparatus that identifies a track of an information recording medium and records the information on an alternative track when information cannot be recorded on the track, the information reproduced from the alternative track is stored. An information recording/reproducing device characterized by having an alternative track buffer. (2) The information recording and reproducing apparatus according to claim 1, wherein the alternative track buffer has a capacity of one track or more. (3) In claim 1, the track buffer includes a track buffer for inputting and outputting information to and from the outside, and when reproducing information from the alternative track, information is transferred from the alternative track to the inputting and outputting track buffer. An information recording/reproducing device characterized by storing. (4) In claim 1, there is provided: management information recording means for recording management information for managing the track; management information holding means for reading and holding the recorded management information; and information on the information recording medium. storage means for reproducing information from the alternative track corresponding to the defective track and storing the reproduced information in the alternative track buffer before reproducing information from the reproduction area; reproducing information from the information reproduction area; An information recording/reproducing apparatus comprising: a transfer means for transferring information stored in the alternative track buffer to a track buffer.