Restoring a scratched disk. How to repair a scratched DVD disc. How to clean a disc from scratches

It is very difficult to keep rims in their original form. They are constantly exposed to external influences that have a negative effect on the surface. This causes scratches and chips. Many drivers often ask the question, how can you remove scratches from a disc? Today this has become possible thanks to the latest technologies restoration of coverage.

Repair features

To restore the coating and remove scratches, you must first study the nature of their occurrence. For example, working with forged products is much more difficult than processing cast wheels. To achieve a good result, it is best to seek help from professionals.

Models made in the USA, Japan and European countries are perfectly repaired. To restore a scratched disc, a variety of technological processes are used:

1. You can use the method of polishing the top layer of coating.
2. Partially paint over the damaged metal surface.
3. Install branded emblems on branded samples.
4. Use special spare parts.
5. Apply alternative methods to remove visual scratches.

Polishing the disc is very popular, after which the scratches are completely removed. However, this technique does not always help. If the depth of the scratch reaches the metal, it will not be possible to remove it by polishing. More complex work will be required. Fortunately, modern technologies make it possible to completely restore any disk

Keeping rims new for several seasons is a very difficult matter, because these elements are the first to encounter all unfavorable conditions. external influences on the way of the car. In this regard, they require regular updating, and most often repairs are necessary to eliminate scratches and chips on the disks. This will be discussed further.

About painting and polishing

If it is necessary to repair car wheels by repainting them in a garage, liquid enamels and varnishes are more convenient. The powder method of applying paint material without a polymerization chamber is impossible. However, such paint high quality and following the painting technology, it lays quite firmly on the surface of the part.

The quality of painting wheels on a car is determined by the thoroughness of preparation for repair, which includes removing the old paintwork, degreasing and priming the surface. Let's take a closer look at how you can return rims Great look and remove scratches and chips in garage conditions.

What do you need for work?

Before you start updating disks and removing scratches, you need to prepare the room. The garage needs to be cleaned, cleared of dust and debris, after which, if possible, it is necessary to treat the walls and floor with water to remove the remaining dust. This way it will not press on the surface of the car part being painted.

Now you can prepare what you need to complete the job:

• water, detergent and a brush to remove dirt from the discs;
• sandpaper of various grains for removing small scratches and sanding;
• white spirit for degreasing disks;
• finishing putty to seal cracks in parts;
• acrylic primer and paint in cans (or in cans if you plan to use a spray gun);
• clear nail polish;
• gloves, respirator and safety glasses.

To update car rims to remove scratches, it is recommended to use paint and primer from the same manufacturer. Also, if you have a mini-wash available, the discs can be cleaned with it.

From sanding to priming

All stages of repairing scratches and chips on disks are as follows:

• cleansing;
• padding;
• direct painting;
• applying varnish.

The first step is to free the car wheel rims from rubber and thoroughly clean and wash them. It is also recommended to check them for unevenness and, if necessary, straighten them; it is better to entrust this work to specialists.

After cleaning, the surface grinding stage begins. Sanding is done using sandpaper, which helps remove old paint from the disc. On at this stage You can also use a drill with a special attachment.

While sanding, use water to remove any old paint that has come away from the surface. Sanding should be carried out with a decrease in the abrasiveness of the paper, completing the processing with the finest sandpaper.

If there are deep scratches, cracks or chips on the part, they are repaired by covering them with finishing putty, which, after drying, is sanded with zero-grade sandpaper (M 40).

The surface has been prepared, and now you can proceed to the next stage of repair - applying primer, which helps subsequent layers of paint to adhere better to the discs and also provides some anti-corrosion protection.

Important! Before priming, parts must be degreased using white spirit.

Then the primer is applied in two or three layers, each of which must be allowed to dry. Before applying primer to the surface of the disc, carefully read the instructions. Shake the can periodically during priming.

Painting and varnishing

It is better the next day after applying primer to them. Painting is done in almost the same way as priming, that is, in 2-3 thin layers with drying of each of them.

The repair stage of coating the discs with varnish is carried out in two layers, and in order to completely dry after this, the discs must be left alone for 3-4 days. After this, the parts can be treated with a special polish and begin to be used.

There is another option

You can repair car rims and remove small chips and scratches by using epoxy paste instead of putty and primer. This product consists of two components - the paste itself and the hardener. After washing, cleaning, sanding and degreasing, they need to be mixed and applied to damaged areas with scratches and chips, then remove excess and allow to dry (see the time on the packaging of the specific paste).

It is better to use white paste so that it does not show through the paint that will be applied on top of it.

You can dry the epoxy material under ultraviolet lamps, which will allow the paste to dry faster and set well. If you repair the discs without removing the rubber, then it must be sealed with masking tape.

After the epoxy has set, it needs to be sanded with fine-grit sandpaper, eliminating any unevenness. Then the discs are also painted with acrylic paint and varnished. After the repair, it will not be superfluous to treat the rims with car polish.

There is a shelf with discs in every family. With the development of technology, it has become possible to store various information in this way: documents, photos, videos of memorable events, favorite music, etc.

But from frequent use or careless handling, such a necessary item becomes covered with scratches over time. We often forget to put them away after viewing the stored data and leave them lying on the table. As a result of such treatment, scratches appear on the discs.

In this form, it is difficult to use the disk for its intended purpose, and sometimes it is completely impossible to view information from the damaged “storage”.

How to Remove Scratches from a Disc Using Toothpaste

If the damage to the surface is minor, you can use improvised means. You will need toothpaste and a soft polishing cloth. The work should be done like this:

• Place the damaged disc on a flat surface.
• Apply a small amount of toothpaste.
• From the center to the edge, with slight pressure, run the cloth over the surface.
• Clean the surface of the paste with wet wipes, and if necessary, rinse with warm water.
• Allow the product to dry and then carry out a test run.

If the result is negative, you can repeat the manipulations in the same order again.

Toothpaste will help if the damage is not too severe. If there are more serious scratches on the surface of the product or they are small, but there are a lot of them, use special compounds, designed to eliminate this type of damage from delicate surfaces.

This compound is ideal for polishing small scratches. It is used not only on disks, but also when repairing damage from LCD TV screens or monitors. You need to do the following:

• Dilute the paste with an alcohol-containing solution according to the instructions.
• Soak a piece of soft cloth in this.
• Perform polishing.

Then you should clean the surface of the disk, and after it dries, try to start it.

You will need to apply a thin layer of wax to the surface of the disc and rub it gently with a lint-free cloth. In this method, scratches are not polished, but filled with wax. But if the damage is very deep, the disk may not be recoverable.

The listed methods are mechanical, but there are also software ones. It is possible to recover data using specialized software. Find data recovery programs from damaged disk possible on the Internet.

You can also try to tidy up the “storage” using equipment designed for this purpose. Such machines cost from 25 dollars for home use and from $300 for industrial. After polishing, scratches on the disk may still be visible, but the readability of the data will significantly improve.

So as not to spoil computer disk Finally, it is necessary to follow the rules for removing damage. When restoring a disk, keep the following in mind:

• Avoid touching the surface with your fingers so that fat from the skin does not remain on the disc; you need to hold it only by the edges;
• do not polish the surface of the disc with toothpaste too often, otherwise there will come a time when the protective layer will be irrevocably damaged;
• When diluting GOI paste, aggressive solvents must not be used;
• in order not to damage the disc even more, before cleaning with wax you need to make sure that there are no dust particles on the surface;
• Do not use large mechanical forces during polishing, as pressing will damage the thin layer of data.

The above methods may not give the desired result and in some cases it is not worth the risk and take the product to specialists rather than try to correct the situation yourself. Professionals will cope with this problem easily and for reasonable money.

The conclusion suggests itself - disk damage is much easier to prevent than to fix. Therefore, follow the storage rules, place them in special envelopes or boxes, and when using them, try to touch the surface with your hands less. After finishing work, do not leave the “keeper” on the table, but put it away immediately. This will protect the disc from damage and scratches.

Instructions

Take a napkin or handkerchief and wipe the paste off. Prepare a piece of cotton wool, roll it into a ball, apply a little Vaseline on it and rub it on the scratched areas to remove scratches from. Then simply wipe the screen with a clean handkerchief or napkin.

First of all, carefully sweep or blow off the dust from the matrix, then wipe with a damp cloth and microfiber cloth. If you do not sweep away the dust, you may scratch the matrix. Clean the lid in the same way. Next, remove shallow scratches from the cover.

Practice first on damaged discs before polishing. Apply polishing liquid to the scratch area and wipe gently. The shallow scratch should disappear in a couple of minutes. If necessary, apply polishing liquid to the area again and wipe it again with a napkin or piece of cotton wool.

In the same way, you can remove scratches from your mobile phone, player and other devices. This method Not suitable for removing scratches from LCD screen, it may remove the top layer of material and damage the screen. After you have finished polishing the surface of the laptop, wipe the area with a napkin or microfiber cloth.

Sources:

• how to remove scratches from monitor

It's hard to imagine a person without a phone these days. Each of us always has it in our pocket or purse. mobile phone. Our mobile phones are different, but the consequences of using the phone are the same. Sooner or later, scratches appear on the display or case. As a result, someone changes the case, someone changes the phone itself, and someone tries to remove these defects. Not worth buying just because of a few scratches new phone. There are many restoration methods.

Instructions

Rub a small pebble of paste onto a piece of hard woolen cloth and rub it into the scratched areas. It will take an hour and a half to achieve the effect, but the result is worth it. The display will be like new, scratches will disappear.

There is another way. You can wipe down the screen with a nail file. First, take a highly abrasive file and work on the screen, then take a softer file. Treat the surface. This is not the best method, because the glass will acquire a matte tint and lose a certain amount of transparency. In addition, this method is not suitable for removing scratches from the case.

Some craftsmen remove scratches using toothpaste and a brush. But the paste must be taken for smokers and transparent.

You can remove scratches using sewing oil and a piece of terry cloth. Place some oil on a cloth and rub the screen. Use a clean cloth to remove any remaining oil from screen. Try not to touch the screen after the procedure; purchase a film for this.

You can remove scratches by using it on discs. Apply polish to the damaged surface using a piece of cotton cloth and rub the screen for several minutes. Then use a clean cloth to remove any remaining polish. All these methods will help you forget about scratches.

Video on the topic

Related article

Sources:

• how to remove scratches from display

Scratches and abrasions on surfaces furniture, mirrors or cars spoil the owner’s mood. The thing looks shabby and old. But small and shallow spots can be quickly disguised at home.

Instructions

Prepare a special mastic. Heat 3 parts of turpentine over low heat and dissolve 4 parts of wax in it. Stir thoroughly, pour 2 parts of alcohol into the mixture and stir again. Using a piece of woolen cloth soaked in pure gasoline, rub the scratch on the furniture. Then apply the mastic with a cotton swab and rub it until shiny with a soft woolen rag. Store this mastic in a closed glass jar.

Match the color of children's crayons to the color of polished furniture. Apply strokes across the scratch using your chosen chalk. Remove excess with cardboard. Rub a few drops of lemon oil into the scratch using a soft cloth. Instead of crayons, buy furniture grout and rub it with furniture polish.

Mask a scratch on dark-colored furniture with iodine. Apply iodine solution to the scratch in several layers until the color of the damaged area matches the main color of the furniture. Scratches On light-colored furniture, rub with Brazil nut or walnut oil, tung oil or vegetable oil. Cover white scratches with shoe polish.

Buff out the scratch on your car with wax. If the scratch is not very deep and has not reached the ground, purchase a special pencil from a car dealership, apply it and polish the surface with a coarse or medium abrasive polish. However, this procedure will have to be repeated almost every time you wash the car.

Buy a CD polish. You can use it to mirror or phone screen. Apply the product to the damaged surface and rub thoroughly with a cotton cloth. Remove excess with another rag.

Fill the scratch with putty if it is large and deep. Remove any excess. Wait until the material is completely dry. Using soft sandpaper, level the surface. Carefully paint the area with a suitable color of stain and apply a coat of primer varnish to protect surfaces.

Sources:

• car scratch chalk

Even with the most careful handling of a particular product, it is impossible to completely protect against scratches on it. Can bring quite a lot of trouble scratches on plastic parts, for example in a car. To eliminate significant faults, you will need to contact a repair shop, but small ones scratches on plastic you can easily clean it yourself.

You will need

• Abrasive paste, grinder, sandpaper, plastic primer, water, rags, acetone, varnish

Instructions

First prepare the surface to be repaired for repair. If possible, separate the part with the scratch, clean it of dust and rinse thoroughly. If the product is painted, use sandpaper or a sander to remove loose paint in the area, being careful not to leave any rough spots there.

Clean the surface of the product treated with sandpaper with acetone. To do this, saturate a clean rag (it should be lint-free) with the mixture, and then blot the area where the scratch is located. In this way you will clean the surface of any remaining dirt.

Apply to the area where the scratch is located, moving the spray stream parallel to the surface of the product. Apply a thick layer of primer first, then reapply a thinner layer after drying. If necessary, you can add a third, lightest layer to the two layers. After this treatment, the surface plastic must dry.

Sand the surface again with sandpaper and wipe with acetone. Now paint it the color you want. Be careful when choosing the shade of color to avoid any noticeable difference between the color of the base coat and the color of the workpiece. Spray the paint in two or three thin layers, allowing the paint to dry after each application. If the scratch is deep enough, the number of layers should be increased. Remove paint stains immediately with a clean, damp cloth.

Set aside the painted product until the paint has completely dried, after which it is ready for further use.

Video on the topic

Nowadays we use various plastic products. Often, for various reasons, the surface of the plastic becomes dull and cloudy, for example, this is clearly visible on plastic car headlights. Often appearance plastic parts suffer due to the mechanical effects of dust. This is when the need to polish the plastic arises.

You will need

• - sandpaper of different grain sizes;
• - abrasive polish from 3M, No. 1 and No. 2;
• - polishing sponges;
• - a clean rag.

Instructions

Mechanical polishing of a plastic surface begins with smoothing out scratches using emery cloth. Small scratches caused by friction with dust can be eliminated with P600 or P1000 sandpaper, it depends on the depth of the scratches. Larger scratches can be sanded with coarser sandpaper, such as P220. Use only new sandpaper, since the surface of the plastic is not very hard and requires great care. You cannot put pressure on such a surface, because... this causes even more damage to the surface. The vast majority of plastic windows and profiles are made from such PVC plastics. When working with sandpaper, make reciprocating movements along a short straight line, and then the same movements, but at an angle to the previous ones. This will prevent you from making new scratches and will do the job better. Remember to blow off any plastic dust that forms. Solid

You will need:

• Scratched disc
• Water, soap
• A piece of soft cloth
• White toothpaste

It happens that the CD on which a very important information or simply the material you need becomes unusable. Namely, it turns out to be scratched, and, as you know, almost all players do not want to read scratched discs in any way. The CD may be scratched due to falling or simply due to careless handling.

This type of deformation of a CD, such as scratches, may prevent the information from it or any part of it from being read. Such a disk will “stick” and “slow down”, since the drive laser beam will not be able to fully read all the necessary data from it. If there is just dust or fingerprints on the disk, then this can be easily fixed - just wipe it with a soft cloth and the problem is eliminated.

But if these are scratches, then it’s a little more complicated. How to clean a disc from scratches using improvised means and without making Herculean efforts? Quite simple. All you need is warm water, soap, a soft cloth and toothpaste. Take the disc, wash it with warm water and soap, then gently, without force, blot the CD with a soft cloth.

Do not rub, but rather blot, so as not to leave even more additional scratches. If the disc is only slightly dirty, simply wipe it with a slightly damp cloth. Sometimes only this action is enough for the disc to start playing. Now take the disk and place it on a surface that is not too hard (the disk may also become deformed on top). Next, you should polish the protective coating of the CD.

This is what toothpaste is used for. Take the most ordinary, white one toothpaste- It is not advisable to use a paste of a different color. How to clean a disc from scratches with toothpaste? A small amount of toothpaste should be applied to a piece of cotton wool. But don’t think that if you apply a lot of paste to the cotton wool, the polishing will be better. Everything here should be in moderation.

When polishing, do not rub the disc too hard, so as not to leave new scratches. Now you should carefully clean the disc from the polish with a cotton swab and alcohol. If the disc is not readable, then repeat the entire procedure as many times as necessary. The disc should not be wiped “in a circle”, as this leads to damage and then your disc will certainly not be readable.

uznay-kak.ru

How to repair a scratched DVD disc.

If you are looking for optimal solution, how to restore the functionality of a scratched DVD, and if you want to do it at home and using improvised means, then perhaps this article will tell you a few useful tips.

Scratched DVD disc can really ruin your fun while watching a movie, listening to your favorite music tracks, etc. Almost every user has encountered a similar problem at least once in their life. Even a small scratch can prevent data from being read from the disc. If you have problems, the first thing you need to find out is whether the disk can be restored or whether it is hopelessly damaged. Take the disk and look through it at the light source. If there are areas on the disc that are visible through, then it cannot be restored. Contrary to popular belief, damage to the outside of the disk is much more dangerous than damage to the inside (from which the laser beam reads data). Even minor damage to the outside of the disk can lead to its inoperability.

If the disk does not “shine through” in the light, then you can try to restore its functionality by polishing the surface.

Methods and means used for polishing DVD surfaces

Using car polish

To do this, you need to get a piece of good, soft fabric. The best option will be a material used for cleaning jewelry and crystal items.

Apply a few drops of car wax to the DVD and wait until it dries. Then use a soft cloth or cotton swab to thoroughly wipe the DVD. Do not use circular motions along the CD tracks. This may lead to its final damage. Your movements should go from the center of the disk to its edges.

With toothpaste

One of the most popular and time-tested methods is to use toothpaste as a polishing agent. Yes, the most ordinary toothpaste; it is better to use brands with a whitening effect (they usually contain soda).

All you need to do is apply toothpaste to the DVD. Then spread it evenly, using your fingers, over the entire surface of the disk. Next, use a soft cotton cloth to thoroughly wipe the disc. When wiping the disc, do not apply strong pressure to its surface. When you finish wiping the disc, rinse it in warm water. Place the disc on a paper towel and let it dry on its own. After it has completely dried, it must be thoroughly wiped again with a dry cotton cloth. Play the DVD and see if the problem goes away or is significantly reduced. If not, you can repeat the entire polishing process again. Polishing the disc surface with toothpaste is one of the the best ways restore functionality of a scratched DVD.

Polishing a Scratched DVD with Vaseline

This may seem surprising to many, but you can try to restore the surface of the disc using regular Vaseline. As with the methods described above, you first need to apply Vaseline to the surface of the disc, and then, after a few minutes, use a soft cloth or cotton swab to wipe the DVD. After the polishing process, try to play the disc. Make sure the problem goes away.

We have given the most simple and effective ways restoring a scratched DVD. In conclusion, we will give you some useful tips and recommendations.

• When polishing a scratched surface of a disc, place it on a flat, non-abrasive surface. Do not bend the DVD disc.
• Never polish in a circle along the tracks of the disc. This will only make the problem worse. The disc should only be cleaned using movements from the center to the edge.
• Try not to touch the surface of the disc with your fingers to avoid leaving fingerprints. Always hold it by the edges only.
• if the disk contained data that was very important to you, then it is advisable to immediately seek help from a data recovery specialist, since “folk” remedies do not always help eliminate the problem, and any incorrect actions or unnecessary efforts can only aggravate problem.

kompogolik.ru

How to properly clean a CD

Hi all. In addition to cleaning CDs with soap and water, there are many other effective ways. This article will tell you how and with what to clean compact discs (CDs and DVDs).

Often, many people have a situation when they put a disc into the drive of a computer or player, but it freezes and “doesn’t want” to play, or plays, but “in fits and starts.” What causes this? First of all, due to improper handling of the disk or the fact that the disk has been in use for a very long time. If there are scratches on the surface of the disc, then there is a high probability that it will not play correctly. In such cases, cleaning may help, although the success of this will largely depend on the extent of damage to the disc's coating. There are many “folk” ways to clean CDs and DVDs, some of which can surprise even seasoned and experienced users with their creativity.

How to clean a CD or DVD?

Use water and a soft cloth. First of all, rinse the CD thoroughly. This is done in order to remove dust, adhered particles and greasy stains from the surface. Immerse the CD or DVD in warm water, keep it there for a while, then take a soft, lint-free cloth and wipe the surface of the CD. Do not scrub the surface too thoroughly or harshly. In order not to damage the data on the disk, there is a certain “pattern” of cleaning actions. When cleaning, you need to start from the center of the disc and move towards the edge. Never use towels, toilet paper, paper towels, or any other materials or items that may cause fine scratches on the surface of the disc. Let the disk dry completely, and then check whether data is read from it correctly and whether it works without failures or pauses.

Cleaning the disc surface... banana. Most users don't even realize that...a banana can be used to clean a scratched disk. Take a fresh banana and cut it into two parts. Wipe the surface of the CD/DVD disc with it in a circular motion. Next step, is to clean the surface of the disc with a soft cotton cloth. Before you start playing a disc, it will be better if you use a cleaning spray and then wipe the disc with a dry and soft cloth.

Using toothpaste or Vaseline. The surface of the disc can also be cleaned using some household items, such as toothpaste or petroleum jelly. However, this method can be used if the scratches are not too deep. Place an appropriate amount of any of these products on the surface of the disc and wipe it gently with a soft cloth. After, for final cleaning, use a cleaning spray, wipe the disc dry and try to play it.

Use polish or a special wheel cleaner. If the above remedies are powerless, you can use a metal polish or a set of wheel cleaners. After wiping the disc with a cloth with polish applied to it, then wipe the disc with a soft, clean cloth, let it dry, and then try to play it. If it still does not work properly, try the last option, use specialized disk cleaning fluids.

These are just a few tools that can effectively clean the surface of CD/DVD discs. There are other methods, for example, using alcohol, soda, etc. as a cleaning agent.

helpsnet.ru

Restoring scratched discs

Working surface optical disks easily damaged - the protective layer becomes scratched even with not too intensive use. Deep defects often lead to the impossibility of extracting information from damaged media. Next, we will tell you how to restore a scratched disc by polishing using toothpaste, GOI paste, and also consider some “harmful” tips from the CD Resuscitation Network.

Rules for working with damaged optical discs

Let us say right away that an unreadable media with deep scratches can be restored in this way, at best, only partially. Moreover, you will have to act extremely carefully, otherwise the surface can be completely damaged. It would be better to first practice on old unnecessary media before restoring a disk with valuable information - this way you can evaluate the effectiveness of the method and, as they say, get better at it.

And do not try to immediately resort to using the method described below when a reading error occurs - check the disk on another computer - often it is the DVD drive that causes the problems. In addition, there are a lot of applications that allow you to extract maximum information from scratched blanks thanks to a modified reading algorithm. One effective solution is Durable Copy.

It is advisable to use the program to work with discs that have already been restored by polishing, because we have already noted that heavily damaged media can never be restored 100%.

How to polish a blank with toothpaste at home

The most affordable and safe way polishing - using toothpaste:

The movements during the polishing process should not be too intense so that the surface does not heat up quickly. There is no need to put pressure on the blank either. After 15-20 minutes, rinse the disc thoroughly in warm water. Its surface may become matte due to the appearance of many microscopic scratches, but deep damage will become much less noticeable, which should have a better effect on the readability of the disc.

Dry optical drive, try inserting it into your DVD drive. If your goal is to retrieve photos, important documents, etc., use Durable Copy or similar app. Surely this time there will be noticeably more copied intact information.

If necessary, restoring the working surface using the method described above can be repeated, but it makes sense to carry it out for no more than an hour. As practice shows, polishing with paste for too long causes the opposite effect - there is less readable data on the media.

Professional polishing method

For truly valuable and expensive disks, such artisanal methods should no longer be used. To obtain an acceptable result, the polycarbonate base will need to be polished with fine abrasive GOI paste (sold in hardware stores) using an electric drill with a grinding attachment:

If you do not have a power tool, polishing with GOI paste can also be done manually, but positive result At the same time, it is far from guaranteed, and the process may take a long time.

How not to restore optical discs

You can often read a lot on the Internet alternative ways restoration of scratched compacts. For example, sometimes it is recommended to polish simply with soft or denim cloth. It is clear that you cannot polish the surface with non-abrasive materials. It will simply overheat and the media will no longer be recoverable.

Another extreme option (real advice from “experts” on the Internet) is polishing with fine-grained sandpaper. This method can immediately ruin the surface without even making an effort. The same applies to heating the disk in the microwave, under table lamp and so on.

Another popular tip from the Internet is to cover the scratch with “green paint” or even completely treat the surface of the compact with it.

Allegedly, after this, the laser beam will stop refracting from the walls of the scratch and will hit exactly the desired sector. However, the optical properties of the polycarbonate surface of the blank and the “green paint” are completely different, and even after drying, the latter will cover the scratch unevenly. It is clear that you will not do anything worse to your compact using this method, but the result will be zero, not counting the wasted time, green fingers, stains on the table, etc.

Therefore, only surface polishing can significantly improve disc readability. To extract more information, use the utilities Durable Copy, IsoBuster, DeadDiscDoctor, File Salvage, etc.