JPH01211243A - Information recording medium - Google Patents

Abstract

PURPOSE:To heighten the activity ratio of a recording medium and to realize fast seek by recording the address where the abnormality to give inconvenience on the tracking of a tracking device is generated at a prescribed position. CONSTITUTION:A controller 2, when receiving a seek instruction to the address M at a present head position R, performs calculation of (R-M), and when it judges that a distance requiring coarse seek is needed, and judges whether or not an error track exists within a range of (M+ or -N) from a error table in the controller 2 setting N as coarse seek position accuracy. As a result, when the error track exists in the range, is judged that a track P exists in the inside of the M when it is P<M, and in the outside when it is P>M. Therefore, a head 5 arrives at a point Q where is the outside of the track address M when it exists in the inside at the time of completing seek assuming a targeted address by the coarse seek as (M+N). After completing the coarse seek, a present location is read out from the medium 1, and is compared with the track address M, and when coincidence is obtained, an operation is completed. When non-coincidence is obtained, seek of one track is performed in a direction to approach the track address M, and such processing is repeated until Q=M is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a recording/reproducing device that uses a human-wearable recording medium and that enables high-speed access even if the medium contains defects. Regarding information recording media used for.

[Background Art and Problems to Be Solved] In recent years, optical disk devices have come into use as large-capacity recording media. It is well known that auto-tracking is an essential technology for devices that use optical recording media such as optical discs. However, not only optical disks but also optical recording media generally have a higher error rate than magnetic recording media. These errors range from simply not being able to record or reproduce information to serious errors that cause tracking loss. Conventional optical disks do not have an appropriate means for avoiding defects in media that may cause tracking loss, and are basically designed for use with defect-free media. Therefore, if there is a defect that causes tracking loss, the seek operation is performed while tracking as in normal operation, so the defect does not cause tracking loss and cause the current position to be lost. There was a problem in that high-speed access performance was impaired as the process was repeated. Furthermore, if tracking loss occurs when recording information, there is a risk of destroying surrounding data.

Furthermore, since conventional devices do not have appropriate means to avoid media containing defects that cause tracking loss as described above, all media are inspected to see if they cause tracking loss at the time of shipment, and only non-defective items are inspected. It was being shipped. This is a problem in terms of cost since the defective rate is inevitably high for optical recording/reproducing media which originally have a high error rate.

In addition, recording/reproducing bags jδ that use optical recording/reproducing media
Many of them enable media exchange. If the media is replaceable, it is difficult to have a sealed structure like a fixed magnetic disk drive, so it is inevitably susceptible to dirt and dust, and dirt and dust on the media can cause tracking loss. be. In such cases, conventionally, when tracking loss is detected, several tracks around the detected track are rendered unusable and excluded from track access targets. This conventional method has the problem that a large number of tracks are discarded due to a single defect, resulting in a significant reduction in the effective usable area of the total usable area of the recording medium.

[Means for Solving the Problems] In view of the problem described above, an object of the present invention is to provide a device having a coarse seek means and capable of high-speed access, without impairing high-speed access performance, and to solve the problem of error occurrence. An object of the present invention is to provide an information recording medium for use in an information recording/reproducing apparatus that employs an access method that makes it possible to exclude only the following information from access targets.

The above object is to prevent, in an information recording medium used in an information recording and reproducing apparatus that performs a seek operation using a tracking means, the address of an abnormal location on the recording medium that causes trouble in tracking by the tracking means to a predetermined address on the recording medium. This is achieved by an information recording medium characterized in that information is recorded in a specific location.

[Function] The track access method of the information recording/reproducing apparatus using the information recording medium of the present invention is based on the positioning accuracy N of coarse seek and the track address information P that causes tracking loss (hereinafter abbreviated as error track information). , when performing a seek, if the distance is such that coarse seek must be used, compare the target track address M and the error track information @P,
If there is no P in the range of M+N, seek to the target track address, otherwise, by knowing the positional relationship between the error track and the target track from P and M, search from the error track position R1, whichever one does not have P. The above problem is solved by adopting a method of approaching the target track M. For example, if there is an error track P between the current position and the target track M, the error track position iP is skipped,
Furthermore, a method is adopted in which a seek is made to a position beyond the target track position M, which also exceeds the coarse seek positioning accuracy N at the target track position M, and from there, the target track is reached by using a fine seek machine. Therefore, high-speed access performance is not impaired even on a recording medium with many defects.

In order to implement such an access method, a recording medium that records address positions of defects that cause tracking loss is essential. Also, depending on when the data is recorded, it can take various forms. For example, the abnormal part of the recording medium that causes the above-mentioned inconvenience causes tracking loss that is inspected at the time of shipment of the recording medium.
? clI If the recording medium is defective (including dust, scratches, etc.), or if an abnormal part of the recording medium that causes an inconvenience in Section 611 is a defect in the recording medium (dust, scratches, etc.) that causes tracking loss that occurs after the recording medium is shipped. ) is Nato.

In addition, the functions of the recording medium (for example, playback only, append only,
If the address of the abnormal area is recorded at the time of shipment (pre-format format), or if the recording medium is a write-once type or rewritable type, the address of the abnormal area may be recorded depending on the There are cases where address recording is performed when a recording medium is used.

In the information recording main device using the information recording medium of the present invention, when the recording medium is used for the first time, all the tracks are inspected and all track addresses that have caused track off are detected in a predetermined location on the recording medium. An information recording and reproducing device characterized by recording a track address at a predetermined location on a recording medium, and an information recording and reproducing device characterized by recording a track address that causes a track off during seek execution such as recording and reproducing operations at a predetermined location on a recording medium. etc. are possible.

[Example] Hereinafter, an information recording medium according to the present invention will be described in detail based on the drawings.

FIG. 2 is a schematic configuration diagram of an optical disk device to which the track access method according to the present invention can be applied. In the figure, l is an optical disk, 2 is a controller that controls the access method of the present invention which will be described later, 3 is an interface signal bus for commands of a computer, etc. at -L, 4 is a seek motor, and 5 is an optical head for recording and reproducing. , 6 is optical disk I
It is a spindle motor that rotates. Note that a computer (not shown) determines what cannot be processed by the controller 2 that controls the access method of the present invention.

In general, a recording/reproducing apparatus using a recording/amphibious medium having a large number of information tracks has phase seek and fine seek functions as a seek execution mechanism in order to realize high-speed access. To explain the coarse seek and fine seek functions of the apparatus shown in FIG. 2, the seek motor 4 performs rough positioning using the output of an encoder (not shown). The track pitch of an optical disc is several microns, whereas the minimum pitch of an encoder is several tens of microns, so the track pitch is now 2 μm and the encoder is 40 μm.
If m, the position error due only to the encoder output will be a maximum of 20 tracks. In contrast to this coarser seek, fine seek is realized by moving a tracking actuator (not shown) in the optical head 5 in FIG. 2 in the radial direction of the disk. 6 FIG. 3 shows track access according to the present invention. It is a diagram that best represents the characteristics of the method, and is a diagram showing tracks of a disk-shaped recording medium. In FIG. 3, R is the current head position, M is the target track position, P is the error position where tracking loss occurs, and Q is the temporary target track position according to the present invention. Moreover, FIG. 4 is a flowchart explaining the operation of FIG. 3.

The access method according to the present invention will be explained using FIGS. 3 and 4.

Assume that when a seek command to address M is received (step 50 in FIG. 4), the current head position is point R. When the controller 2 calculates (RM) and determines that the distance requires coarse seek, it determines whether there is an error track within the range of M±N or not based on the contents of the error table 10 in the controller 2. (Step 51)
). This is due to the error track P in terms of phase seek accuracy.
This is to determine whether there is a danger of passing through.

If there is an error track within that range (YES in step 5I), the operation according to the present invention is executed. Also, if there is no error track within that range (NO in step 51),
), performs a normal seek to the target track M (step 55). If there is an error track P within the range, it is then determined whether P is larger than M (step 52). This is to determine whether the track exists. When P<M, we know that the error track P is located inside the target track M when viewed from point R, and when P>M, we know that the error track P is located inside the target track M.
Know what is on the outside. When it is on the inside (as shown in Figure 3), the positional accuracy of coarse seek is N tracks, so by setting the target address of coarse seek to M+N, the target track M is reached when coarse seek is completed. The head will definitely land at the Q point on the outside (step 53).
.

After the coarse seek is completed, the current address is read from the medium L (step 56) and compared with the target track address M (step 57). If they match, the seek operation is complete (step 59); if they do not match, the current address is The address seeks one track toward the target track address M (step 58), returns to step 56, and thereafter repeats steps 56 to 58 until the condition Q=M is satisfied.

The above is the basic flow.

Further, if the difference between the current address Q and the target track address M is greater than or equal to a predetermined amount in step 58, a so-called multi-track jump is used to jump to multiple tracks without checking the track address, and the jump is performed by a predetermined amount. Embodiments may then be taken to return to step 56.

In addition, in steps 52 and 53, there is a meaning of having a margin for the coarse seek error N, or since the coarse seek error ffN may change depending on the coarse seek amount, N+a (a
is a positive integer) to N, it is also possible to absorb the overrun of the head 5 due to overshoot or the like.

Note that even when the error track P is in front of the destination track M when viewed from %R, or when the current address R is inside the destination track M, the same steps as described above can be executed. realizable.

FIGS. 6(a), (b), and (c) are diagrams showing examples of such patterns, where R is the current track position, M is the target track position, P is the error track position, and Q is the temporary track position. The dashed line indicates the track jump from R to Q.

(a) is when the error track P is in front of the target track M when viewed from the above-mentioned R, and (b) is the case.

(c) is a diagram showing a case where the current address R is inside the target track M.

In order to implement the above-described access method, an error table 10, which records the positions of error tracks as shown in FIG. 5, is required. FIG. 1 is a diagram showing a recording medium having an area 80 in which the error table 10 is recorded, in which (a) shows a disk-shaped recording medium and (b) shows a card-shaped recording medium.

In this way, the error table 10 is recorded at a predetermined location on the recording medium, and the controller 2 reads information from the location and creates the error table 10 in the built-in memory.

Next, an embodiment of an information recording/reproducing apparatus according to the present invention for recording error information on a recording medium will be described.

Note that in the information recording and reproducing apparatus according to the present invention, the recording and reproducing apparatus refers to an apparatus that has at least one function of reproducing, recording, and erasing processing.

When an unrecorded medium is loaded into the recording/playback device, the recording/playback device automatically or by receiving a command from a higher-level device (not shown) connected to the recording/playback device automatically tracks the error track. starts detection operation. This method of detecting an error track is performed by sequentially reading out track addresses, and if there is no mistracking within the track, jumping to the next track, and if so, repeating the operation of reading out the address of that track. FIG. 7 is a flowchart showing an example of the detection operation. In the figure, first, determine the first number of the track to be inspected (Step 71 in Figure 7).
When you start tracking and detect an error track (
(YES in step 73), the controller 2 stores the track address in the error table 10 within the controller 2 (step 74) and uses this information to restart the track from the track next to the error track using the access method of the present invention. The error track detection operation is repeated (step 79). When the entire surface of the medium is finished (Y in step 75)
ES), the information of the error table IO is recorded at a predetermined location on the medium 1 as shown in FIG. 1 (step 78).

Information recording media that record such error data can record error data in a state close to pre-format at the time of shipment, even if it is a playback-only recording medium, and if it is a recordable or rewritable recording medium, It is possible for a user to record error data while using the recording medium.

For example, when tracking loss occurs due to a media defect during normal recording, playback, or seek execution,
By recording the track address at a predetermined location on the recording medium, it is possible to avoid the influence of scratches on locations that were not present at the time of inspection. Alternatively, in normal recording, reproduction, etc., by using the error track detection operation in conjunction with the error track detection operation, it is possible to avoid the influence of scratches or the like on locations that were not present at the time of inspection.

Furthermore, although the above embodiments have been explained using an optical disk device as an example, the idea of the present invention can be similarly implemented in an optical card in an optical card device that employs substantially the same tracking method as the optical disk tracking method. is clear.

[Effects of the Invention] As described above in detail, according to the access method of the present invention, (1) Only error tracks can be avoided and used, so the medium usage rate increases.

■High-speed seek performance is not impaired even if there are many error tracks.

■ By using multi-track jump and single-track jump for fine seek, it has extremely excellent practical effects such as high-speed seek is possible even if the phase seek position accuracy is poor, and according to the recording medium of the present invention, This also has the effect of making it possible to construct a high-speed access and error track processing system depending on the recording medium and information processing system used.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a recording medium of the present invention on which an error table is recorded. FIG. 2 is a schematic configuration diagram of an optical disk device to which the track access method of the present invention can be applied. FIG. 3 is a diagram that best represents the features of the track access method of the present invention, and is a diagram showing tracks of a disk-shaped recording medium. FIG. 4 is a flowchart illustrating the operation of FIG. 3. FIG. 5 is a diagram showing an error table. FIG. 6 is a diagram illustrating an access method to which the present invention is applied. FIG. 7 is a flowchart illustrating an example of a method for writing an error track address. 1: Recording medium, 2: Controller, 3: Interface path for connecting with host device, 4: Seek motor for performing coarse seek. 5: Optical head, 6: Spindle motor for rotating the disk. Agent Patent Attorney Minoru Yamashita Figure 1 (b) Figure 2 Figure 2 (Response) ÷ Figure 5 Figure 6 (a) (b) (C)

Claims (6)

[Claims] (1) In an information recording medium used in an information recording and reproducing device that performs a seek operation while using a tracking means, an address of an abnormal location on the recording medium that causes trouble in tracking by the tracking means is recorded at a predetermined location on the recording medium. An information recording medium characterized by: (2) The abnormal portion of the recording medium that causes the inconvenience is a defect (including dust, scratches, etc.) in the recording medium that causes tracking loss that is inspected at the time of shipment of the recording medium. Information recording medium. (3) The abnormal portion of the recording medium that causes the inconvenience is a defect (including dust, scratches, etc.) in the recording medium that causes tracking loss that occurs after the recording medium is shipped. information recording medium. (4) The information recording medium according to claim 1, wherein the address recording of the abnormal location is performed at the time of shipment. (5) When the recording medium is a write once type or a rewritable type recording medium, the address recording of the abnormal location is performed when the recording medium is used.
Information recording medium described in section. (6) It has a means for reading a track address recorded on a recording medium and a means for seeking to a specified track address, and the seek means has a coarse seek means and a fine seek means, and the positioning accuracy by the coarse seek means is N tracks, and when the specified target track address is M during a seek operation using phase seek, if the track P that causes off-track is within the range from M to (M+N), then (M -N-a) address (a is any positive integer), and
If it is within the range from M to (M-N), then (M+N+a)
Used in an information recording and reproducing apparatus using a track access method characterized by executing a seek using an address as a temporary target track address, and then seeking using a fine seek means until reaching the true target track address M. The information recording medium according to claim 1.