JPH04102269A - Controlling method for controller for optical disk device - Google Patents

Abstract

PURPOSE:To shorten operating time on a block in which a defectivesector exists in presence inspection for defective sector by referring to a pointer that is a mark placed at a nearest group in the previous inspection for an address in a targeted small block. CONSTITUTION:A recording operation and a collating operation are performed at every small block in a prescribed range in a recording block in a recording mode. In a reproduction mode, the reproduction operation is repeated sequentially starting from a low address at every small block in the prescribed range. At this time, the inspection this time is performed by referring to the pointer that is the mark placed at the nearest group in the inspection last time, and also, as the small block in the presence inspection and operation execution of the defective sector, sectors from a first sector to the sector one before the defective sector in the small clock are set as one small block, and an alternate sector as one small block, and the ones in the prescribed range from the sector following the defective sector as one small block.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control method in a control device that is connected between a host computer and an optical disk device and controls the optical disk device.

(Prior Art) In recent years, optical disk devices such as magneto-optical disk devices have been used for recording computer data, document files, and the like.

The magneto-optical disk cartridge used in this magneto-optical disk device is a magneto-optical disk for recording/playback that can be freely erased and rewritten, and is made of resin for ease of handling and to make it removable from the recording/playback device. It is housed in a case.

FIG. 3 shows an example of the configuration of a conventional magneto-optical disk used in the disk device shown in FIG. 4, which will be described later.
is a bottom view, and FIG. 2B is a partially enlarged cross-sectional view.

As shown in the figure, the conventional magneto-optical disk 2 has a substrate 2a, which is a disc made of transparent resin such as polycarbonate, on one surface of which is made of Fe, Co, etc. for recording and reproducing information using the magneto-optic effect. , Tb, Gd, etc.
A protective film 2c made of ultraviolet curing resin or the like is further formed on the protective film 2b, and a hub 4 made of a metal plate for driving the disc 2 is fixed to the center of the disc. As mentioned above, it is housed in a resin case (not shown) and becomes a magneto-optical disk cartridge.

In the recording area 3 of the magneto-optical film 2b of the disk 2 where information is recorded/reproduced, a large number of recording tracks are formed in a spiral shape at a pitch of 1.5 μm. Each recording track has 21 sectors each consisting of a data area where information is recorded/reproduced and a management area where summary management information is recorded. Further, the recording area 3 is provided in a lead-in area on the outer periphery, and stores recording/reproducing control information necessary when recording/reproducing information in this area 3, such as position data of sectors that have undergone alternative processing, which will be described later. It consists of a recording/reproducing control information area 3a where a defective sector table is recorded/reproduced, and a data area 3b where general information is recorded/reproduced.

FIG. 4 is an explanatory diagram of recording and reproducing operations of an example of a conventional magneto-optical disk device.

As shown in the figure, a conventional magneto-optical disk device 5 is used with the magneto-optical disk 2 mounted thereon, and an electromagnet 6,
It is composed of an optical recording/reproducing device 7, a feed device 20, a base 21, and the like.

The above-mentioned magneto-optical disk 2 is driven by a CAV3.600r spindle motor (not shown) fixed to the base 21.
The magneto-optical film 2 is rotated by the electromagnet 6 which is rotationally driven by pa+ and is disposed on the protective film 2c side with a gap in between.
A vertical bias magnetic field of a predetermined polarity is applied to b as necessary. Further, information is recorded and reproduced from the substrate 2a side onto the magneto-optical film 2b using the laser beam 16 from the optical recording and reproducing device 7.

This optical recording/reproducing device 7 includes a laser diode 8, a collimating lens 9, a beam splitter 10, a raising prism 11, an objective lens 12, a polarizing beam splitter 13,
Condenser lenses 14A and 14B.

It is composed of photodiodes 15A, 15B, etc.

The laser light emitted from this laser diode 8 is made into parallel light by a collimating lens 9, and then
A beam shaping prism (not shown) shapes the cross-sectional shape of the beam into a predetermined shape, and the beam passes through the beam splitter 10 and enters the rising prism 11 . The laser beam 16 reflected by the raising prism 11 is focused by the objective lens 12 as a light spot 17 with a minute diameter on the surface of the magneto-optical film 2b on the recording track of the recording area 3 of the disk 2. irradiated on top.

A light spot 17 irradiated onto the surface of this magneto-optical film 2b
has a light intensity suitable for recording when the device 7 is operating in the recording mode, and has a light intensity suitable for reproduction when the device 7 is operating in the playback mode. As in, laser diode 8
It is controlled by an output control device (not shown).

In this recording mode, the perpendicular magnetization direction of the magneto-optical film 2b on the recording track is reversed by the bias magnetic field of the electromagnet 6 only where the optical spot 17 hits, based on a digital signal corresponding to the recording data. This causes the digital signal to be recorded.

In the case of the reproduction mode, the direction of rotation of the polarization plane of the laser beam reflected on the surface of the magneto-optical film 2b changes depending on the perpendicular magnetization direction of the magneto-optical film 2b due to the magneto-optic effect. , the objective lens 12 and the rising prism 11, the light is reflected by the beam splitter 10, and is incident on the polarizing beam splitter 13 via an L/1172 wavelength plate (not shown). The laser beam transmitted through the polarizing beam splitter 13 is transmitted through the condensing lens 14.
The laser beam is focused by the photodiode 15A, converted into an electric signal by the photodiode 15A, and output as a detection signal, and reflected by the polarizing beam splitter 3. The laser beam is focused by the condenser lens 14B. The photodiode 15
It is converted into an electrical signal at B and output as a detection signal.

At this time, the magnitude of this rain detection signal changes in opposite directions depending on the direction of rotation of the polarization plane described above due to the action of the polarizing beam splitter 13, so the digital signal is reproduced from the difference between the rain detection signals. be exposed.

Of the optical recording/reproducing device 7, the laser diode 8
, collimating lens 9, beam splitter 10. Polarized beam splinter 13, condensing lens 14A 14B,
A fixed unit 7-1 consisting of photodiodes 15A, 15B, etc. is fixed to the base 21, and a movable unit 7-2 consisting of the raising prism 1, objective lens 12, etc. is connected to the feed device. 20 moving parts 2
It is installed in 0b. In this foot device 20, a movable portion 20b moves in the radial direction of the disk 2 along a guide rail (not shown) via a bearing 20C by the driving force of a linear motor 20a of a second device 20 fixed to a base 21. and moving the optical subsystem 17 to a range from the inner diameter to the outer diameter of the recording area 3 of this disc 2.
The recording track is searched by performing a so-called wide operation. Note that this base 21 is configured to be held by the main chassis of the device 5 (not shown) via a vibration isolating mechanism (not shown).

In addition, a so-called focus servo, which automatically follows the focus of the optical spot 17 on the surface of the magneto-optical film 2b in response to surface wobbling of the disk 2, is a focus servo based on the output of the detection signal. Based on the servo signal, the vertical position of the objective lens 12 is controlled by a focus servo actuator 18 mounted on the movable part 20b of the feed device 20.

Also, a so-called tracking servo, which automatically follows the optical spot 17 on the recording track with respect to the eccentricity of the disk 2, uses a tracking servo signal based on a detection signal output from the management area to move the optical spot 17 onto the recording track. This is done by controlling the position of the lens 12 in the radial direction of the disk 2 by a tracking servo actuator 19 mounted on the movable part 20b. The movement range of the optical spot 17 in the radial direction of the disk 2 due to this tracking servo operation is normally limited to several hundred μm. The servo operation and rough positioning are responsible for the feed operation.

The operation of the conventional magneto-optical disk device 5 described above is as follows.
This is an outline to explain its operating principle.
In actual operation, the recording mode includes a series of operations: erase, write, and verify.

That is, in the above-mentioned conventional magneto-optical disk 2, since the magneto-optical film 2b cannot be overwritten, which is possible with magnetic tapes, magnetic disks, etc., the recording operation is first performed prior to the recording operation. An erasing operation for the section is performed, and then a recording operation is performed. Also, since this magneto-optical film 2b lacks reliability, a verification operation is performed after this recording operation. That is, this recording section is played back (read), the recorded signal and the playback signal are compared, and if they match,
Move on to the next action. In the case of non-matching, the recording signal that was scheduled to be recorded in the defective sector is recorded again in the alternative sector of the alternative area provided in advance, and then the verification and the address recording in the defective sector table are performed. , so-called alternative processing is performed.

FIG. 5 is an explanatory diagram showing the structure of a defective sector table in the disk of FIG. 3.

As shown in the figure, the defective sector table in the conventional disk 2 consists of n sets of addresses, which are the position data of n defective sectors, and addresses of alternative sectors corresponding to these defective sectors. are sorted in descending order of defective sector address and summarized in a table. This registration in the defective sector table is performed by performing the above-mentioned alternative processing on defects discovered during the inspection process during the manufacturing process of the disk 2 before shipping.
There are cases where the information is recorded in advance, and cases where alternative processing is performed and recorded when the disk 2 is used in the disk device 5.

Control of the magneto-optical disk device 5 is performed by a control device connected between the device 5 and the host computer.

FIG. 6 is an explanatory diagram of the operation of an example of the control device of the disk device shown in FIG. 4, in which (A) shows the operation in the recording mode, and (B) shows the operation in the playback mode.

As shown in the figure, a conventional control device 1 is connected between a host computer 30 and the magneto-optical disk device 5. As shown in FIG.

As shown in Figure (A), in the recording mode,
The host computer 30 outputs signals such as a recording command, recording section designation, and recording data to the control device 1. In this control device 1, during a recording operation, an error correction code is added to the recording data and modulation is performed to generate a recording signal. This control device 1 instructs the device 5 to switch between erasing operation, recording operation, and verification operation, controls the bias magnetic field by the electromagnet 6, controls the output intensity of the laser diode 8, and directs the objective to the recording section. The position of the lens 12 is controlled, and a recording signal is input during a recording operation.

After the recording operation is completed, this device 5 inputs a reproduction signal for a verification operation to the control device 1.

In this control device 1, the reproduction signal is demodulated, the above-mentioned verification is performed, the above-mentioned alternative processing is performed as necessary, and a recording command completion report is sent to the host computer 30.

As shown in FIG. CB), in the playback mode, the host computer 30 outputs signals such as playback commands and playback section designation to the control device 1. The control device 1 instructs the device 5 to perform reproducing operations, controls the electromagnet 6, controls the laser diode 8, and controls the position of the objective lens 12 in the reproducing section.

The control device 1 performs demodulation, error detection, and correction on the reproduced signal from the device 5, and outputs reproduced data to the host computer 30.

Next, a method of controlling the recording and reproducing operation of the magneto-optical disk device 5 by the control device 1 is as follows. In the recording mode, 20 sectors are recorded on 20 consecutive tracks, and the optical spot 17 is moved forward and backward after one rotation of the recording track. Return to the track of
An example will be explained in which the time required for the kick pack operation is one sector's worth of rotation time (1/21 [ffl rotation).

FIG. 7 is a control operation flow diagram showing a method of controlling recording operations in the control device of FIG. 6.

As shown in the figure, the method of controlling the recording operation in the conventional control device 1 is that, in the recording mode, first an erasing operation is performed for the recording section all at once, and then a recording operation and a collation operation are performed, respectively. This recording section is a small section divided into predetermined range units, for example, this small section is sequentially repeated in units of 20 sectors. That is, initially, 20
Regarding the tracks, an erasing operation is performed during 200 revolutions of the disk 2, and during the next revolution, a search operation is performed from the 20th track to the 1st track, and during this time, the polarity of the bias magnetic field by the electromagnet 6 is changed. Change from erasing to recording. Next, regarding the first small section from the first sector to the 20th sector of the first track,
The recording operation is performed during 721 revolutions, and the optical spot 17 is returned to the starting point of the first sector of the first track by a kick-pack operation during the next 1/21 revolution. Next 2
Verification operation is performed during 0/21 rotation. In addition, the above-described alternative processing is performed as necessary. Next, the second track of the first track
Move to the second small section from the 1st sector to the 19th sector of the 2nd track, repeat the same series of operations as the above-mentioned operation in the 1st track, and then move to the 2nd small section from the 2nd sector to the 21st sector of the 20th track. This is repeated sequentially up to 21 small sections.

Furthermore, in the playback mode, since the recording track of the disk 2 is spiral-shaped, in normal operation, the playback operation is performed sequentially along this recording track. The processing operation is performed in units of small sections within a predetermined range, for example, 19 sectors. In other words, the time required for error detection and correction is the rotation time of one sector (1/21 rotation), and in the event of an abnormal operation such as inability to correct an error, a retry is made to perform the reproduction operation again for the same small section. Therefore, if the kick-pack operation is performed, the light spot 17 will return to the starting point of the first sector of this same small section.

Next, a conventional method of checking the defective sector table described above with reference to FIG. 5 will be described with reference to FIG.

FIG. 8 is a flowchart showing an example of a conventional control method in the control device shown in FIG.

As shown in the figure, in the conventional control method, in both the recording mode and the playback mode, an investigation is started in step 201, and in step 202, an investigation is performed on the small section to be read/written this time. Before starting the operation, the presence/absence of a defective sector address is sequentially investigated starting from the first set of the defective sector table, and the investigation is ended in step 203.

That is, when the disk device 5 is started, the disk 2
The recording and reproduction control information area 3a is reproduced, and the read defective sector table is stored in the memory provided in the control device W1. Next, in the recording mode explained using FIG. , the 1st sector to the 2nd sector of the 1st track
Regarding the first sub-section up to sector 0, before starting the operation for this sub-section, sequentially from the first set with group number 1 in the defective sector table in FIG. , the presence/absence of defective sector addresses 1 to n is investigated. Similarly, regarding the second sub-section from the 21st sector of the first track to the 19th sector of the second track, a defective sector may be detected during the operation to the first sub-section before starting the operation to this sub-section. Starting from the first set of tables,
The existence or non-existence of the defective sector address is investigated, and thereafter this investigation is similarly carried out from the second sector of the 20th track to the 21st sub-section, which is the 21st sector.

In this defective sector table matching check, if there is no matching, the operation is performed as shown in FIG. or,
If applicable, for example, if the above-described alternative processing is performed for one sector in the second sub-section, first, the above-mentioned recording is performed from the first sector of this second sub-section to the sector before the defective sector. Then, a search operation is performed to a replacement sector for this defective sector, a recording operation is performed to this replacement sector, and further a search operation is performed to a sector next to the defective sector in the second subsection. is performed, a recording operation is performed from this sector to the last sector, and then, after the kick-pack operation, the collation operation is performed in the same order as in the recording operation.

(Problems to be Solved by the Invention) The conventional control method as described above is such that, in the defective sector table corresponding investigation, the defective sector table is checked from the first set of the defective sector table for each small section within a predetermined range within the recording section. Since the defective sector addresses are sequentially checked to see if they correspond, there is a problem in that it takes time to check the defective sector table.

In addition, this small section is a recording section divided into predetermined range units, and in the case of a small section that is found to be applicable in this defective sector table pertinent investigation in the recording mode, the recording operation and the Since it is necessary to perform the search operation before and after the collation operation, there is a problem that the operation time in the recording mode is long in this case.

The present invention has been made with attention to the above points, and is a magneto-optical disk device that has a short defective sector table applicable investigation time and a short operation time for a small section that is applicable in the defective sector table applicable investigation in the recording mode. The object of the present invention is to provide a control method for a control device for an optical disc device such as the above.

(Means for Solving the Problems) A control method in a control device for an optical disk device of the present invention includes a host combinator, a defective sector address, and an alternative sector address on which alternative processing has been performed corresponding to the defective sector. A control method in a control device that is connected to an optical disk device using an optical disk in which a defective sector table in which a set of defective sectors is registered is recorded in a specific area within a recording area, and controls the optical disk device, the control method comprising: In a recording mode in which a series of operations such as erasing, recording, and collation are performed in a continuous recording section according to a recording command from a computer, at least the recording and collation operations are performed as a series of operations for each small section within a predetermined range within this recording section. , in playback mode, playback operation is performed for each small section within a predetermined range.
The address of each sub-section is repeated in order from the smallest address, and before executing the operation for each sub-section, each
Referring to the defective sector table sorted in the order of the defective sector addresses, in order to investigate whether or not this defective sector address corresponds to the address in the small section targeted this time, The above-mentioned problem will be solved by conducting the current investigation by referring to the pointer that has been drawn.

Further, in the control method in the control device for an optical disk device of the present invention, in the above-described control method, when the defective sector table is found to be applicable, the first section of the corresponding small section is The above problem is solved by treating the sector from the sector to the sector before the defective sector as one small section, the alternative sector as one small section, and the predetermined range from the sector next to this defective sector as a - small section. It is something.

(Embodiment) A control method in a control device for an optical disc device according to the present invention is such that, in the control method in the control device as described above, in the recording mode, the recording is performed at least for each small section within a predetermined range within the recording section. The operation and verification operation are a series of operations, and in the playback mode, the playback operation is sequentially repeated for each small section within a predetermined range, starting from the smallest address in each small section. Before executing the operation, refer to the defective sector table sorted in the order of the defective sector addresses, and check whether the addresses in the small section targeted this time are applicable to this defective sector address. In addition to conducting the current investigation by referring to the pointer placed on the nearest group,
As a subsection for defective sector table pertinent investigation and operation execution, if this is applicable, one subsection is used from the first sector of the corresponding subsection to the sector before the defective sector, one subsection is used for the alternative sector, and one subsection is used for the defective sector. A predetermined range from the next sector is treated as a small section.

An embodiment of the present invention will be comparatively explained under the same conditions as the above-mentioned conventional example.

FIG. 1 is a flow chart showing an embodiment of the control method of the present invention in the control device shown in FIG. , the same figure (A) is in the recording mode, the same figure (A) is in the recording mode,
B) is in playback mode.

The control method according to the embodiment of the present invention is different from the conventional control method described above in that the recording operation and the verification operation are executed as a series of operations, and the pointer is added to the defective sector table corresponding investigation. The differences are in the use of
Descriptions of parts similar to those in the conventional example will be omitted.

As shown in FIG. 1, the control method of one embodiment of the present invention is as follows:
In the control device 1, an investigation is started in step 101 in both the recording mode and the reproduction mode by referring to the defective sector table stored in the memory, and in step 102, a pointer is placed at the previous investigation. The set is compared with the small section to be read/written this time to determine the positional relationship. If the set in which this pointer is placed is in the front (on the smaller address side), in step 103,
Backwards from the set where the pointer is placed (the side with the larger address)
I'm going to investigate. If the group on which the pointer is placed is located at the rear, the search proceeds from the group on which the pointer is placed forward in step 104.

Then, if this pointer or the placed group is included in the small section to be read/written this time, and if the above-mentioned step 103
, 104, in step 105,
Place the pointer at the nearest set before the address of the last sector of the small section to be read/written this time, and step 10
6, the investigation will be concluded. This pointer serves as a mark attached to the set of defective sector tables stored in the aforementioned memory.

Specific examples of the timing of the above-mentioned investigation and the method of execution are as follows:
As shown in FIG. 2(A), in the recording mode, first,
The above-mentioned search operation to the start point of the first sector of the first track is performed, and during this time, the above-mentioned defective sector table pertinent investigation is performed for the first small section from the first sector to the 20th sector of the first track. If there is no match in this investigation, an erasing operation is performed for this first small section.

During this time, the second sub-section is investigated, and if there are 5, the area from the 21st sector of the first track to the sector before the defective sector is 2O-X (X is an integer from 1 to 19). ) The erase operation is performed using the sector range as a second subsection. During this time, a survey was conducted on the third subsection.
5, after the search operation, an erase operation is performed using the range of the [alternative sector] sector as the third sub-section, and during this period, the fourth sub-section is investigated, and if it is not found, After the search operation, 2 from the next sector of this defective sector.
The erasing operation is performed using the 0 sector range as the fourth subsection.

When the erase operation is completed for the 20 tracks of the recording section by repeating the above-mentioned investigation and operation, a search operation for the start point of the first small section is performed, and the above-mentioned erase operation is completed. Since there is a possibility that the above-mentioned alternative processing will be performed in the meantime, the first small section will be investigated during this time, and if it is not applicable, the above-mentioned kick pack operation will be performed for this first small section. Then, the recording operation and the collation operation are continuously performed as a series of operations. During this time, an investigation was conducted on the second subsection, and if there were 5 cases,
For this second subinterval, which ranges from 20-X sectors,
A recording operation and a collation operation are successively performed as a series of operations with the kick pack operation in between. During this time, the third sub-section is investigated, and since there are five such sectors, after the search operation, a kick-pack operation (actually, a kick-pack operation) is performed for this third sub-section, which is the alternative sector. I
/21 rotation and rotation wait 19/21 rotation), recording operation and collation operation are performed, and during this time, the above-mentioned fourth sub-section is investigated, and if there is a search operation, 20
A recording operation and a verification operation are performed on this fourth small section, which is the range of the sector, with the kick pack operation in between, and this investigation and operation are repeated in the second section, which is the recording section.
This continues until the 0 track is completed.

Further, as shown in FIG. 2B, in the playback mode, a search operation is first performed to the start point of the first sector of the first track, and during this time, the search operation from the first sector of the first track to the start point is performed. The first small section, which is up to 19 sectors, is investigated, and if there is no match, a reproduction operation is performed for this first small section. During this time, the second sub-section is investigated, and if there are 5, it is 19-y (y is 1) from the 20th sector of the first track to the sector before the defective sector.
The playback operation is performed using the range of sectors (an integer from 18 to 18) as the second subsection. During this time, the third sub-section is investigated, and since it is found to be relevant, after the search operation, a reproduction operation is performed with the range of one sector, which is the alternative sector, as the third sub-section. 4 small sections are investigated, and if there are no such 5 sections, after the search operation, a reproduction operation is performed with the range of 19 sectors from the next sector of this defective sector as the 4th small section, and this investigation and operation are repeated. This continues until the recording section of 20 tracks is completed.

The control method of the embodiment of the present invention as described above is different from the control method of the conventional example described above, in that when the defective sector table is investigated, the pointer placed in the group closest to the previous investigation is referred to. Since the current investigation will be conducted based on the above, the time for this investigation will be shortened. In addition, the above-mentioned recording operation and checking operation are executed as a series of operations, and if the above-mentioned is applicable, the period from the first sector of the corresponding small section to the sector before the defective sector is completed as a small section for this investigation and operation execution. Since the subsection and alternative sector are treated as one small section, and the predetermined range from the sector next to the defective sector is treated as one small section, in recording mode, in this investigation, the operation time to the corresponding small section is calculated. be shortened.

In addition, in the control method of the embodiment of the present invention described above, we have described an example in which the investigation is performed from step 104 of the flowchart in FIG. You may search toward the set where the pointer is placed.

(Effects of the Invention) The control method of the control device for an optical disk device according to the present invention as described above can reduce the investigation time for investigating the defective sector table and the operation time when the defective sector table is found to be applicable. Improves functionality. Also, since it can be implemented only by changing the software program,
Improved feature-to-cost ratio.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing an embodiment of the control method of the present invention in the control device shown in FIG. 6, FIG. The figure is a configuration diagram showing an example of a conventional magneto-optical disk used in the disk device shown in FIG. FIG. 6 is an explanatory diagram showing the structure of a defective sector table in the disk of FIG. FIG. 8 is a flowchart showing an example of a conventional control method in the control device of FIG. 6. DESCRIPTION OF SYMBOLS 1... Control device, 2... Magneto-optical disk (optical disk), 5... Magneto-optical disk device (optical disk device), 30... Host computer. Patent applicant: Victor Japan Co., Ltd. Representative: Takubu Bojo

Claims (2)

[Claims] (1) An optical disk in which a host computer and a defective sector table in which a set consisting of a defective sector address and an alternative sector address for which alternative processing has been performed corresponding to the defective sector are registered are recorded in a specific area within the recording area. A control method for a control device that is connected to an optical disk device using a host computer and controls the optical disk device, the control device performing a series of operations of erasing, recording, and collation in a continuous recording section according to a recording command from the host computer. In the recording mode, the recording operation and collation operation are performed as a series of operations at least for each small section within a predetermined range within this recording section, and in the playback mode, the playback operation is performed for each small section within the predetermined range. The operation is repeated in order from the smallest address. Before executing the operation for each small section, the defective sector table, which has been sorted in the order of the defective sector address, is referred to and the address of the current small section is determined. Regarding the address, when investigating whether it corresponds to this defective sector address or not, refer to the pointer that is the landmark placed in the group closest to the previous investigation,
A control method in a control device of an optical disk device, which is characterized by conducting this relevant investigation. (2) As a subsection for the defective sector table applicable investigation and operation execution, if applicable, one subsection is from the first sector of the corresponding subsection to the sector before the defective sector, and one subsection is used for the alternative sector. 2. A control method in an optical disc device control apparatus according to claim 1, wherein the predetermined range from the sector next to the defective sector is treated as a small section.