CD dye divided into three categories: Cyanine, AZO, Phthalocyanine. The same type of dye, according to different requirements for deployment, the performance difference is there will be great. Now generally believed that the three dyes, the peptide has the best light stability of cyanine, azo, followed by cyanine dyes relative to the worst (see the destructive light test:). But it also proved that the light stability and the specific disc manufacturers, the quality of the disc itself has a great relationship.

DVDR relatively simple classification of multi-dye, and adjusted the azo dye is rapidly becoming a mature DVDR dyes, and cyanine, cyanine peptide did not do that, so soon as azo dyes currently on the market Almost all types canon lp-e5 battery of DVDR dye used – even if R & D capabilities as a dye extremely well, the inventor of cyanine dye pigment produced by Taiyo Yuden disc as well.

In general, the identification of dye type is relatively simple: There is no cosmetic additive, the use of three dye colors CDR DVD face significant difference. DVDR addition to early to see purple-red dye used (a modified cyanine suspected, not sure), the current use of azo dyes are basically, burning dark blue face.

Body color with the gold reflective layer : Burning surface color with silver or aluminum reflector , Burning surface color
Cyanine blue, greenish green (green plate) is light blue (light blue panel)
Peptide Jing pale golden yellow (gold plate) near colorless yellow (platinum plate)
Azo blue, have not seen this with purplish blue (dark blue plate / light blue disc)

In the CDR, the issue is not particularly significant. Because in the CDR, the dye side of the substrate is thick sony np-fm50 battery, the other side is a reflective layer in addition to the protective coating layer. The protective layer coating on the seal is good, not easy to fall off. Unless the printing surface has been hit hard, protective layer and reflective layer are physical damage, CDR of the dye layer is basically not experience oxygen. Is not the case on the DVDR, the dye and reflective layer sandwiched between two layers of substrate, the substrate bonding process being tested. Inner bonding area in the gripping area between the small ring and big ring, relatively wide, but the bonding process is precisely the defects of the hardest hit.

Disc recording quality is the basis of life, if the original recording quality is bad, the light reflected signals becomes blurred, a little by the time the disc has been aging, soon to be difficult to read; the other hand, if the recording quality excellent thus reflected signal clearly visible, even if some deterioration of aging, the clarity of the signal is still higher than the threshold read head dell inspiron 1720 ac adapter, the disc is still readable, life becomes longer.

State dye test disc: C1C2/PIEPIF test is a simple, feasible and practical and effective method, the former for the CDR / RW, which is used to DVDR / RW. PIE / PIF test in Nero CD-DVD Speed ​​and LiteOn KProbe software generally referred to as a PIE / PIF test, Plextor dedicated PlexToolProfessional called PIPO test.

Paying particular attention to testing the read speed setting. Relatively low speed setting, such as 2X, 4X, which do not exceed the 8X case, the stability of the substrate does not have a major impact on the test, such a low reading speed test major test case of school dyes. Integrated high-speed test is more reflected two factors dyes and substrates of high-speed stability.

The poor quality of the disc, the substrate and the reflective layer will not be too serious problem, change the molecular structure of dye after recording is complete enough, compared with the original state is the disc speed is a strong decisive factor in test scores. Generally believed that the test results should be excellent disc is the premise of a flat curve with a lower C1C2/PIEPIF value. However, save for the disc, it may not necessarily pursue low C1C2 / PIEPIF value. For example, the dye may be some more consideration disc storage durability canon nb-4l charger and specially designed inert relatively strong, burning after the contrast is not very strong, test scores will naturally not very good, but the actual life span is very long, the good old data . However, some discs, dye activity, and burn better, but because of their lack of stability leading to the eventual early death or poor workmanship.

Although the results can show C1C2/PIEPIF disc burning effect, but is by no means a complete description of the quality of the disc, the disc does not represent the actual shelf life. C1C2/PIEPIF curve or value is too high ups and downs in such bad results, that the situation is worrying burn disc itself, save the potential doubtful; the contrary, C1C2/PIEPIF good grades, it is only that when the dye in the test disc in good condition and can not be based solely on this point that the preservation of life on the disc will be very long.

Almost all of the discs are considered using the polycarbonate that has excellent temperature stability and optical properties of plastic as a substrate material. Unfortunately, however, new research shows that it is not as reliable by the light, temperature, humidity and even biological factors, life expectancy is likely to fall far short of the expected 100 years, is still the key reasons for the various forms of oxidation, but does not mean that only the oxygen problem.

There are also used between the layers of impurity materials, or materials caused by corrosion between layers to each other, just as a factor, the lack of relevant information.

How to prolong the shelf life CD-ROM

For the recording quality, and personally do not think these brands are particularly outstanding or significantly behind, and often reflect the particular type, brand or even a batch of a few particularly prominent disc burning effect. This disc itself is not stable batch quality, complexity and does not convert the foundry when the relationship between the dye formulas and the continuous improvement strategy acer travelmate 8371-944G32n battery burner burning continuously adjusted with the Firmware update has a lot.

Buy the disc should pay particular attention to the needs of their compatibility with the recorder itself is biased. -R and + R effects in the use of methods and implementation does not reflect on what is the difference, according to their preference recorder can be compatible. The actual disc burning effects are often subject to burn the update strategy, especially when the disc manufacturers have a greater adjustment of the product. Sometimes just a version of Firmware updates can make a completely different disc burning effect.

To name a recent case, Kodak’s 8X + R discs (MID: AML 002) seems to me that the disc has its similar to the price of the more outstanding work. However, Plextor 716A burner, and this disc to 6X, 8X burn the disc have a poor test scores, the curve is neither stable, PIPO (said earlier, similar PIEPIF test) values ​​are relatively high, only the effect of deceleration to be considered satisfactory 4X – 15 minutes or a disc, however not so pleasant. In some other brands of burners on the performance of this disc had a similar situation. However, if the exchange with the LiteOn or NEC burner, but it can have relatively good performance.

Disc practical observation work is needed. An excellent CD-ROM work to DVDR, for example, from the following observation. First, the dye layer and reflective layer intact – not a defect, the overall look uniform, no visible defects. Sputtering using the metal reflective layer coating process, many factors will affect its quality. Such as the substrate is not in place to clean the reflector layer may lead to defects, sputtering process parameter settings, it might result in uneven reflective layer. Objectively speaking, the reflective layer and dye coated discs manufacturing process problems in the more mature now, in retail products is rare, but according to press manufacturers to allow a certain degree of flaws do exist.

Secondly, look at the quality and CDR DVDR bonding a protective layer coating quality. The inner bonding zone should DVDR smooth, and preferably do not contain air bubbles, no local glue glued edges neatly outstanding or retraction of the situation – short, light and saw a bright uniform neat comparison, generally relatively good. Outer protective layer is mainly to see out of the irregular or gluing the edges, that is, “Plastic Tears” is relatively smooth and neat uniform.

Thirdly, look at the process substrate, in addition to the overall smooth, the attention both inside and outside edges, there should be no flash, set in the middle finger hole at the turn, along the outer edge of the sliding disc, there should be no “sting.” Finally, on the disc thickness, the minds of consumers, “a pile of good timber is the top grade” concept is not scientific casio np-40 charger, standard and thin discs but there is no doubt conducive to saving manufacturers of plastic substrate, usually the general reading / burning is not to the effect, but not conducive to high-speed stability, in the old drive on the chuck may also encounter the fault is not tight.

Objectively speaking, the impact is not too large. The thickness of a disc and other disc if you do not compare to the naked eye is difficult to see differences, but the kind of simple method: see 50 pudding barrels packaging, as long as the barrel is the same as or similar to see the height of 50 stacked with barrels at the top there is much distance to the basic can see the relative thickness of the disc.

From the original CD recording times to the present, a lot of disk storage for several years and even began to appear after less than a year of data loss: the performance of the disc is unreadable or damaged data block read errors, or the drive can not be identified. Now enter the DVD recorder to the universal stage, the disc seems to be more common short-lived phenomenon. How long the disc in the end to save.

1, optical and magnetic, cooperation has surpassed the contest

Optical storage disc recorder can be purchased as separate supplies to use, capacity expansion is convenient. Convenience from the exchange dell studio 15 battery, the demolition of the hard disk from the safety and operability is obviously not as good as the independent optical storage disc design. However, optical storage read and write speed is also relatively slow, most of the disc can not be rewritten, not the shortcomings of single-disc capacity. Optical storage and hard disk itself has very different characteristics, both in fact, not much conflict, but to highlight the complementary use of space.

Optical storage is more biased in favor of “deposit” amount of data storage can be large, but the access frequency is not high; or have frequent data exchange requirements, speed requirements are not stringent. The drive not only to “save”, but also to “use”, the data access frequency is relatively higher, the speed also has considerable requirements. DVDRip from high bit-rate video to HDTV DVDISO popular video and even a DVD burner or Blu-ray recorders coming to promote the popularity of the powerful.

2, “data is priceless” slogan does not Luanhan – the timeliness of the data

Tools, the data can not be said is not important, but in particular the various forms of Internet broadband access aspire 5672wlmi battery is now highly popular, they are either very easy to obtain, or version updates frequently, it is absolutely no need for a storage life to ask too much. The vast majority of data backup software and pure, because they are relatively short effective time, there is no long-term storage needs.

For music, the problem even more complicated. A pop music album, the content can be spread long? Listening to music in your habits, how long will cherish it? Popular in this era of fast-food culture, generally speaking, I am afraid that will not be too long. For frequently updated and the relative compact size of MP3 and other compressed formats, hard drive is sometimes a better choice. Long-term storage needs in this area are mostly personal collection, including APE, FLAC lossless compression format that is more favored few. But the reality may often hear only one part, and most is to meet the individual “collections like” or save the record high prices just really rare.

Permanent value has almost purely personal data sony vgp-bpl2: presentation, photos, audio, DV video, or any other form of personal record and work. These data have a lifetime of memorable and unique – can not get from other sources, which require long-term and even permanent preservation, will become the optical storage life made the most demanding applications.

3, the factors that affect the life of the disc

First, we most commonly used as a representative of CDR and DVDR disc burning look at the structure. CD is divided into protective layer, reflective layer, dye layer and the substrate; DVDR read / burn wave length, track pitch and data space is small, focused more sophisticated, so the data read surface layer and nearer, so the use of the reflective layer and dye layer sandwiched between two layers of substrate structure.

Working principle, CDR and DVDR is exactly the same: to issue the laser from reading the side head into the goal, through the substrate and the dye layer, reflected by the reflective layer backtrack. Reflector reflectivity higher light transmission rate under normal conditions the substrate hp 361909-001 battery is also high, mainly depend on changes in optical signals dye. A variety of special organic dye material, with a specific wavelength of light photosensitivity in the specific wavelength of light irradiation will change the molecular structure, relatively low light absorption from state to state more light absorption.

Burning, the head shot the same wavelength with the reading laser beam power, but an order of magnitude above the burning laser beam, the control chip encoding of the data under the control of local irradiation of the dye, so that changes in molecular structure of the site. This reading, these areas absorb more light and less absorption region to form a contrast, simulated the suppression of the disc pit – Taiwan (Pit-Land) effect. This process, if the reflective layer compared to the mirror substrate is almost completely transparent to the air, the dye is semi-transparent mirror layer of the original film. The burning process, this layer is covered under the instructions given on the site burned. Scorched parts of the site compared with the light we need to form a pattern – the arrangement of the data.

Life of each component of the disc, all affect the life of the disc as a whole – should be pointed out, the so-called life, dell batteries for laptop not just to say the case could reach the highest level, it will not be the case occasionally encountered in relatively poor circumstances , while the vast majority of the disc should be a good product under certain circumstances, the preservation of demonstrated performance – this life assessment can only be a probability, in general, estimated.

Reflective layer is manufacturers often like to make an issue of a factor. But the fact that dye is the main determinant of life – its reflective layer instability than significant. General suppression of the aluminum reflective layer disc, burn disk sputtering process and the reflectivity, the gradual improvement of dye technology, has used gold, silver, aluminum and other materials. Reflector material selection is not a major factor, but because these three metals can be sputtered its ease and stability. From the reflectivity, said Dye was more obvious, the different reflectivity of the metal reflective layer and the specific technology in it did not dye as the decisive role. The main reflector is a form of physical injury and damage to oxidation. The antioxidant, gold does have natural advantages acer AC adapter, so in some specially designed for long life as the main demands of the disc, still insist on using gold as the reflective layer material.

Of course, the price of these disks are generally more expensive. However, for normal discs, taking into account the relative lack of work and no particular overall design of the dyes, no problems as long as the manufacturer, reflector sealed, then do not use expensive than gold and silver or aluminum is relatively inexpensive What practical advantages.

Dye’s life, in the current technical conditions, affecting the overall life of the most important factor in the disc, or the most vulnerable part – which makes sense: the functional requirements of reactive dyes must have a certain chemical changes can be produced during the burn , but for preservation, this activity is reflected as an instability. Dye R & D is one of the important goals to achieve this function to solve the contradiction between the stability and preservation: the need for simultaneous writing of a particular wavelength of light activity and other non-inert write wavelengths of light, but also a higher The room temperature stability. Now, dyes have been enough to use, but far from perfect distance is very far away.