CN101842838A - Method for deleting data of optical disk and optical disk drive including optical disk emulation - Google Patents

Method for deleting data of optical disk and optical disk drive including optical disk emulation Download PDF

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Publication number
CN101842838A
CN101842838A CN200880113911A CN200880113911A CN101842838A CN 101842838 A CN101842838 A CN 101842838A CN 200880113911 A CN200880113911 A CN 200880113911A CN 200880113911 A CN200880113911 A CN 200880113911A CN 101842838 A CN101842838 A CN 101842838A
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China
Prior art keywords
data
laser
optical disk
disc
area
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Pending
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CN200880113911A
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Chinese (zh)
Inventor
梁仁畅
具瑛谟
段秉周
闵丙薰
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LG Electronics Inc
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LG Electronics Inc
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Filing date
Publication date
Priority claimed from KR1020070115771A external-priority patent/KR20090014934A/en
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of CN101842838A publication Critical patent/CN101842838A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/006—Overwriting
    • G11B7/0062—Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media

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  • Optical Recording Or Reproduction (AREA)

Abstract

Provided are a method and a device for permanently erasing data of an optical disk in an optical disk drive including an optical disk emulation. According to the method, an erase command of data recorded on an optical disk is received and it is determined whether the optical disk is a rewritable optical disk or not. Then, an output power of a laser to be projected is raised when the optical disk is the rewritable optical disk and then the data recorded on the optical disk are erased through an output power of the laser. Furthermore, the optical disk drive includes an optical disk storage unit, a contents memory unit, a disk type determination unit, a laser power adjustor, a pick-up unit, and a controller.

Description

The method of deletion optical disc data and the disc drives that comprises CD emulation
Technical field
The disclosure relates to the method and apparatus of the optical disc data that is used for permanently wiping the disc drives that comprises CD emulation.
Background technology
Along with to handling the increase that high-quality moves the needs of image, require the large-capacity data stored CD.Therefore, can write down recently and storage of high quality video and voice data reach many hours the rewritable optical record medium of high density and introduce market.
The example of high density rewritable optical record medium comprises: Blu-ray disc (BD), high definition digital versatile disc (HD-DVD) etc.DVD has the recording capacity of about 4.7GB, and BD has the recording capacity of about 25GB.After introducing the BD standard, developed high density of future generation/superminiature optical storage apparatus.The example of high density of future generation/superminiature optical storage apparatus comprises: such as technology such as super lens, holography, near-field recordings.
Recently because these optical storage apparatus (for example, compact disk (CD), DVD, BD, HD-DVD) extensive distribution, thus family or office of company preserved comprise various contents tens to a hundreds of optical storage disc.
Fig. 1 is the block diagram of structure of the disc drives of correlation technique.
The disc drives of correlation technique comprises: CD 21, pickup unit 11, servo unit 12, signal processing unit 14, storer 15 and microcomputer 13.CD 21 is the recording mediums that passed through laser log, reproduction and obliterated data by laser thereon.Pickup unit 11 recoding/reproductions comprise the management information that is recorded in the data on the CD 21.The operation of servo unit 12 control pickup units 11.Signal processing unit 14 will be demodulated to the signal value of expectation from the reproducing signal that pickup unit 11 receives, and maybe the signal that will write down is modulated into and has on CD 21 executive logging and operate the signal of needed form to send this signal.Storer 15 storing reproduction CDs 21 needed various information.The operation of the above assembly of microcomputer 13 controls.This assembly forms recoding/reproduction unit 10.
Pickup unit 11 comprises: such as laser diodes source, collimation lens, by focusing on actuator or following the tracks of object lens that actuator drives, polarization beam splitter, convert the photodetector of electric signal to such as the optical module of cylindrical lens, with light and at record or reproduce the anterior monitor diode of operating period monitoring laser output.
Microcomputer 13 detects the reflected light from CD 21, and calculates catoptrical amount to generate radio frequency (RF) signal of expression about the catoptrical summation in each zone of photodiode by detected reflected light.In addition, microcomputer 13 generates and loses burnt signal (FES), and this signal is the signal that detects the out of focus laser that is shone by pickup unit 11 by Astigmatism methord.In addition, microcomputer 13 generates tracking error signal (TES), and this signal detects the out of focus laser that is shone by pickup unit 11 by the push-pull type method.
Storer 15 storage is used to reproduce CD 21 needed various information, and generally includes random-access memory (ram) and ROM (read-only memory) (ROM) probability that exists with the combination of the theoretical length of storage control program, each hole and bank or each hole and bank.
Controller 23 is responsible for the control all components.
Demoder 22 is in response to the control of controller 23 output data of finally decoding, and then decoded data offer the user.
For the data with user expectation are recorded on the recording medium, scrambler 24 converts input signal to the signal of predetermined format, for example, moving picture expert group 2 (MPEG2) transport stream, and in response to the control of controller 23 signal of conversion is offered signal processing unit 14 then.
As mentioned above, Fig. 1 illustrates the record of correlation technique disc drives and the assembly of reproduction units.About the reproduction of CD, use CD 21, recoding/reproduction unit 10 and demoder 22.About the record of CD, service recorder/reproduction units 10 and demoder 22 in response to the control of controller 23.
Because the content that is stored on the CD 21 is only reproduced/carried out to disc drives, so there is the inconvenience that when the user wishes to carry out other content, should replace CD 21 with new CD.
Therefore, though occurred for when not inserting CD also as there being the needs of the disc drives with CD, operate, and for also increasing gradually by the virtual needs that come to carry out various application by disc drives.
For example, during data on wiping the CD of the recording disk that is recorded in correlation technique in driving, can not be provided for the application of obliterated data permanently.Even deleted the data of record, also exist by the Lead-In Area of recovery CD and the possibility of the data that file system area recovers to wipe.Therefore, this restriction has caused serious restriction to the company that emphasizes very much data security.
In addition, a kind of method of destroying data comprises: by by using sharp-pointed probe in the method for making cut on the optical disc surface and the method for scraping dyestuff (dye) district of carving and destroying on the recording layer.Yet, owing to dyestuff causes pollution problem, and because cut itself may not have the data on the complete erasing CD-disc, so the data recovery also is possible.
Summary of the invention
Technical matters
Embodiment provides a kind of and has permanently wiped data on the CD that is recorded in one-time write or can writes again so that its irreversible method and the disc drives of using this method.
Technical solution
For above purpose, carry out wiping to be applied in the disc drives and carrying out of data erase, and carry out by the disc drives that comprises CD emulation.
In addition, in order to reach above purpose, the setting that the adjustment of laser power and erasing mode be provided is with obliterated data permanently.
In one embodiment, the method for the optical disc data during a kind of erasing CD-disc drives, this disc drives comprise by the data erase of CD emulation to be used, and this method comprises: the erase command of the data of receiving record on CD; Determine whether CD is rewritable CD; When CD is rewritable CD, the output power of laser that raising will be throwed; And wipe the data that are recorded on the CD by this output power of laser.
Wiping the data that are recorded on the CD by the output of laser comprises: come to carry out overriding operation by the laser that is higher than Writing power on the zone of the data that write down, or destroy the border of bank and groove.
This method may further include: carry out overriding operation on Lead-In Area and file system area at least.CD can comprise: Lead-In Area, user data area and leading-out zone, user data area comprise the wherein file system area of log file system data.
In another embodiment, a kind of disc drives comprises: rom memory cell, this rom memory cell write down by CD or reproduce content; Content memorizer unit, this content memorizer unit are stored data erase therein and are used, and operate as virtual CD when not inserting CD; Disc-type determining unit, this disc-type determining unit determine that CD is CD-RW or Write once optical disc; The laser power regulator, this laser power regulator is adjusted the data that output power of laser is come erasing CD-disc; Pickup unit, this pickup unit are carried out the border that overrides operation or destroy bank and groove on CD; And controller, this controller allows the content memorizer unit as virtual CD, and the erase command of the data of receiving record on CD comes loading data to wipe application, and the control optical disc data is wiped.
Described content memorizer unit can comprise the data layout identical with CD.Described laser power regulator can be adjusted into output power of laser greater than Writing power when CD is CD-RW, and can be when CD is Write once optical disc output power of laser be adjusted into Writing power or erase power.
One or more embodiments of the detail have been set forth in the accompanying drawings and the description below.From description and accompanying drawing and accessory rights requirement, further feature will be conspicuous.
Beneficial effect
The disc drives of a kind of method of data of erasing CD-disc and this method of use is wiped and is stored in the data on CD-RW and the Write once optical disc so that it is irreversible, the security solution of the feasible data that can be provided for wiping.
Description of drawings
Fig. 1 is the block diagram of the disc drives of correlation technique.
Fig. 2 is the block diagram according to the structure of the disc drives of an embodiment.
Fig. 3 is the process flow diagram of diagram according to the process before wiping the application beginning of an embodiment.
Fig. 4 is the process flow diagram of diagram according to the erase process after wiping the application beginning of an embodiment.
Fig. 5 comes the synoptic diagram of the method for obliterated data by weakening swinging signal.
Embodiment
To carry out detailed reference to embodiment of the present disclosure now, its example is shown in the drawings.
If possible, employed term is widely used general terms among the embodiment.Yet, when the applicant may state optional term under the specified point situation, the detailed meanings of the term of this selection of statement in the detailed description of correspondence.Therefore, meaning that must be by term but not the disclosure understood in term itself.
Fig. 2 is the block diagram according to the structure of the disc drives 100 of an embodiment.
Disc drives 100 with CD comprises: rom memory cell 110, content memorizer unit 120, disc-type determining unit 140, laser power regulator 150, pickup unit 160 and controller 130.Rom memory cell 110 is stored by CD or is reproduced content.Content memorizer unit 120 is stored data erase therein and is used, and is performed as virtual CD when not having CD.Disc-type determining unit 140 determines that CD is CD-RW or Write once optical disc.Laser power regulator 150 is adjusted the data that output power of laser is come erasing CD-disc.Pickup unit 160 overrides data on CD, or destroys the border of bank and groove.Controller 130 allows content memorizer unit 120 to operate as virtual CD, receives to be used to wipe the erase command that is recorded in the data on the CD, and loading data is wiped application, and the data of erasing CD-disc.
Controller 130 control rom memory cell 110 and content memorizer unit 120.In addition, controller 130 is carried out the optical disc process order of main frame, and it is returned main frame, and control content memory cell 120 is operated as virtual CD.
As described below, the file system of controller 130 copys, and be applied to content memorizer unit 120, and come control content memory cell 120 by the optical disc process order.Therefore, can be virtual CD with 120 emulation of content memorizer unit.
In addition, disc drives 100 further can comprise: CD determining unit (not shown), this CD determining unit determine whether to have inserted CD when the optical disc process order that has main frame.
Content memorizer unit 120 can comprise annex memory, such as the free space of the internal storage in random-access memory (ram), ROM (read-only memory) (ROM) or the disc drives.120 storages various application in content memorizer unit are such as wiping application.
Wipe that to use be the set that is used to destroy or wipe the program that is recorded in the data on the CD, and comprise can explain, control and definite CD wipe engine.
The user can insert disc drives 100 by the PC interface, and is configured to use disc drives 100 by the interface linkage unit.
Controller 130 is controlled rom memory cell 110 and content memorizer unit 120 when the order that receives main frame.
In more detail, when the optical disc process order that receives from main frame, controller 130 determines whether CD has been inserted disc drives 100 according to the CD determining unit.
There is the whole bag of tricks that has determined whether to insert CD.For example, exist the reflected light that occurs by detection after projecting laser to determine the method for CD and the method for determining CD by the change of after rotary CD, measuring rotation momentum.
If determined in disc drives 100, not exist CD by the CD determining unit, then controller 130 control content memory cells 120 allow content memorizer unit 120 to be used as virtual CD in response to the order from main frame to operate, and then the result are returned main frame.
Content memorizer unit 120 is embodied as virtual CD, that is, simulation process, even be not have CD in disc drives 100, content memorizer unit 120 also can serve as CD by the attribute that adds CD to content memory cell 120 to be operated.
In order to carry out emulation, the file system of management optical file need similarly be applied to content stores and play unit 120, and the order of command process CD need similarly be applied to content memorizer unit 120.
Existence will be checked being the attribute of virtual CD with 120 emulation of content memorizer unit.For example, need inspection dish attribute (CD is ROM type or R/RW type), dish size, dish detail specifications (track and zone field), read etc.
In addition, the file system of CD comprises ISO09660, universal disc format (UDF) and UDF bridge etc.File system can be divided into file system area and file data district.File system area comprises the pointer of dish model name, dish size and designation data position.As mentioned above, when carrying out the emulation of content memorizer unit 120, show predetermined dish MODE name to the user by task manager.
In addition, in order to be CD with 120 emulation of content memorizer unit, the optical disc process order need similarly be applied to content memorizer unit 120, and the optical disc process order can comprise Advanced Technology Attachment packet interface (ATAPI).
It is virtual CD with 120 emulation of content memorizer unit that ATAPI allows by " obtaining configuration " order, " test cell is ready " order or " reading capacity " order.
More than order is only used for example of the present disclosure, and the disclosure is not limited to above order.
In addition, filesystem information that can be by copy same as before and use this information or compact disk file system information and use this information file system be applied to content memorizer unit 120.The method of compressed information can change.For example, can use small amount of memory xcopy system by the piece that the usefulness in the extraction document system region not ' 0 ' is filled.
In addition, according to present embodiment, do not extract piece that usefulness ' 0 ' fills and be shifted and upgrade positional information, so that compressed file system by the address.As a result, during map addresses, reduce translocation distance, make and easily to carry out management.
When coming emulation content memorizer unit 120, carry out the application of wiping of the data of optical disk be stored in the content memorizer unit 120 by above process.
According to the disclosure, be included in disc drives 100 rather than the main frame owing to carry out the engine of wiping of wiping application, thus when application is wiped in execution, will wipe application and be loaded among the PC, and host computer invokes is wiped engine and is received the notice of whether wiping.
Therefore, be included in the host PC owing to wipe engine, so can solve the problem of the Another Application interrupt operation when an application is moving.
With reference to figure 2, in case the erase command of receiving, whether the disc-type determining unit 140 just type of the definite dish that will wipe is rewritable.The method of determining disc-type has a variety of.For example, can use physical attribute to determine the type of CD, wherein, dissimilar CDs has different reflectivity respectively.
When disc-type determining unit 140 was defined as CD-RW with CD 101, laser power regulator 150 improved the output power of laser that will throw, and it is higher than Writing power.
Pickup unit 160 overrides operation by next execution of the laser power that is higher than Writing power on the recording layer of CD 101, perhaps destroy the border between bank and the groove.
In addition, when disc-type determining unit 140 was defined as Write once optical disc with CD 101, laser power regulator 150 was adjusted into Writing power or erase power with the output of the laser of projection.
Pickup unit 160 overrides operation by next execution of the laser power that equals Writing power or erase power on the recording layer of CD 101, perhaps destroy the bank of CD 101 and the border between the groove.
In addition, when the data on the erasing CD-disc 101, erasing mode can be set additionally.Erasing mode comprises the quick mode of the important area that destroys CD and destroys the complete pattern in the whole zone of CD.
More specifically, the quick mode minimally destroys the important area of CD, makes the user can not recover CD.Usually, destroy the Lead-In Area and the file system area of the recording layer of forming CD.
In addition, may further include the process that is used to confirm whether suitably to have destroyed data, and this can realize by such fact, promptly after destroying data, suitably do not carry out light pick-up along the track of CD.
The whole zone of pattern erasing CD-disc makes user and expert can not recover CD fully.Usually, when obliterated data under complete pattern, destroy whole recording layer, that is, and Lead-In Area, file system area, leading-out zone and whole data field.Under complete pattern, can on all destroyed zones, confirm to destroy.
In addition, disc drives 100 further comprises: the additional buttons part, and the user can select data corruption at last.Therefore, when data erase operation is provided in the user and provides the order of erasing CD-disc by button part, can improve the reliability that is used for erase operation.
In addition, whether acknowledgement window can be shown as final affirmation dish erase operation and begin.
In addition, when the stand-by state in the button part continues preset time, the mistake of erase command takes place.Therefore, can stop the CD erase process.
No matter how operating system (OS) can be carried out by vertical CD is wiped application, and can read the virtual disk in the driver for the erase operation in any equipment.
Fig. 3 is the process flow diagram of diagram according to the process before wiping the application beginning of an embodiment.
That is to say, comprise according to the method for the obliterated data of embodiment and use virtual disk to use obliterated data permanently by wiping.This method is carried out by using the engine of wiping in the disc drives.
When having the processing command of CD in operation S200, the CD determining unit determines whether CD is inserted in the disc drives in operation S205.According to embodiment, when not inserting CD according to definite result, virtual (emulation) process begins.
Controller is emulation content memorizer unit in operation S210, and in operation 215, select to be stored in the content memorizer unit be used to carry out wipe application, perhaps automatically carry out and wipe application.In this, when execution is wiped when using, its dish that automatically will wipe is identified as selects its oneself disc drives to carry out erase operation.
In operation S220, will wipe application and be loaded in the host PC, and host PC is opened the pallet of disc drives so that insert the dish that its data will be wiped free of.
When insertion will destroy the dish of its data and close pallet in operation S230, data erasing process started from operating S235.
As mentioned above, when the CD determining unit determines that CD is inserted in the disc drives, in operation S240, show interested CD.
Fig. 4 is the wipe process flow diagram of using beginning afterwards erase process of diagram according to an embodiment.
When receiving the erase command of data in operation S300, the disc-type determining unit determines whether the CD that the user inserts is rewritable.As mentioned above, can use physical attribute to determine the type of CD, wherein, dissimilar CDs has different reflectivity respectively.
When the CD that inserts is CD-RW, in operation S310, increase output power of laser.More specifically, the laser power regulator is increased to laser power greater than Writing power.
When the disc-type determining unit has determined that CD can not rewrite, in operation S315, determine whether CD is Write once optical disc.When CD was Write once optical disc, the laser power regulator was adjusted into Writing power or erase power with laser power.
After the size of the laser that will throw according to the type adjustment of each dish, in operation S320, the data execution that will wipe is override operation, perhaps destroy the border of bank and groove.
Fig. 5 comes the synoptic diagram of the method for obliterated data by weakening swinging signal.
As shown in Figure 5, when on the border that high power laser is incident upon bank and groove, can confirm that swinging signal 52 is much more weak than original signal 51.
When swinging signal being weakened, can not read CD more extremely less than proper level.Therefore, CD is destroyed fully.That is to say that laser is followed the tracks of CD in response to the interval of swinging signal or swinging signal, and dissolve the border of bank and groove by high power laser.As a result, adjacent signals by deterioration become to make data recover to become impossible.
Though described embodiment, should be appreciated that very other modification and embodiment that those skilled in the art can find out will fall in the spirit and scope of principle of the present disclosure with reference to its many illustrative embodiment.More specifically, in the disclosure, accompanying drawing and claims scope, carry out various changes and modification at ingredient that subject combination is arranged and/or in arranging.Except that ingredient and/or the various changes and modification of arranging, alternative use also will be conspicuous for a person skilled in the art.

Claims (11)

1. the method for the optical disc data during an erasing CD-disc drives, described disc drives comprise by the data erase of CD emulation to be used, and described method comprises:
The erase command of the data of receiving record on CD;
Determine whether described CD is CD-RW;
When described CD is CD-RW, the output power of laser that raising will be throwed; And
Wipe the data that are recorded on the described CD by described output power of laser.
2. method according to claim 1, wherein, wiping the data that are recorded on the described CD by the output of described laser comprises: come the zone execution of recorded data is override operation by the laser that is higher than Writing power, perhaps destroy the border of bank and groove.
3. method according to claim 2 further comprises: at least Lead-In Area and file system area execution are override operation,
Wherein, described CD comprises: Lead-In Area, user data area and leading-out zone, described user data area comprises: file system area, described file system area log file system data.
4. method according to claim 1 further comprises: when described CD is not CD-RW, determine whether described CD is Write once optical disc.
5. according to the method for claim 4, further comprise: when described CD is described Write once optical disc, come the zone execution of recorded data is override operation by Writing power or erase power.
6. method according to claim 3 further comprises: the erasing mode that described CD is set.
7. method according to claim 6, wherein, described erasing mode comprises: destroy the quick mode of important area of described CD and the complete pattern of destroying whole CD.
8. disc drives comprises:
Rom memory cell, described rom memory cell write down by CD or reproduce content;
Content memorizer unit, described content memorizer unit are stored data erase therein and are used, and are operating as virtual CD when not inserting CD;
Disc-type determining unit, described disc-type determining unit determine that described CD is CD-RW or Write once optical disc;
The laser power regulator, described laser power regulator is adjusted output power of laser and is wiped described optical disc data;
Pickup unit, described pickup unit are carried out described CD and are override operation, perhaps destroy the border of bank and groove; And
Controller, described controller allow described content memorizer unit as virtual CD, and the erase command of the data of receiving record on described CD is used to load described data erase, and controlled described optical disc data and wipe.
9. disc drives according to claim 8, wherein, described content memorizer unit comprises: with the identical data layout of described optical disc data form.
10. disc drives according to claim 8, wherein, described laser power regulator is adjusted into output power of laser greater than Writing power when described CD is CD-RW, and when described CD is Write once optical disc described output power of laser is adjusted into Writing power or erase power.
11. disc drives according to claim 8, wherein, described pickup unit overrides operation to Lead-In Area and file system area execution, and
Described CD comprises: Lead-In Area, user data area and leading-out zone, described user data area comprises: file system area, described file system area log file system data.
CN200880113911A 2007-11-13 2008-01-21 Method for deleting data of optical disk and optical disk drive including optical disk emulation Pending CN101842838A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020070115771A KR20090014934A (en) 2007-08-06 2007-11-13 Method for deleting data of optical disk and optical disk drive including optical disk emulation
KR10-2007-0115771 2007-11-13
PCT/KR2008/000360 WO2009064038A1 (en) 2007-11-13 2008-01-21 Method for deleting data of optical disk and optical disk drive including optical disk emulation

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Cited By (1)

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CN104655028A (en) * 2013-11-22 2015-05-27 睿励科学仪器（上海）有限公司 Focusing system and focusing method for measuring semiconductor substrates

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JP2001307328A (en) * 2000-04-19 2001-11-02 Sony Corp Data writing system, data writing method and optical disk recording/reproducing device
JP2002245635A (en) * 2001-02-21 2002-08-30 Matsushita Electric Ind Co Ltd Data erasing device of optical disk and data erasing method of optical disk
JP2006252729A (en) * 2005-03-14 2006-09-21 Hitachi-Lg Data Storage Inc Optical disk apparatus and method for erasing recorded information in optical disk apparatus
KR100767169B1 (en) * 2006-11-14 2007-10-15 주식회사 히타치엘지 데이터 스토리지 코리아 Method for erasing recorded data on optical disc

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104655028A (en) * 2013-11-22 2015-05-27 睿励科学仪器（上海）有限公司 Focusing system and focusing method for measuring semiconductor substrates
CN104655028B (en) * 2013-11-22 2017-08-22 睿励科学仪器（上海）有限公司 The focusing system and focus method measured for semiconductor chip

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