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"故 忠 告 市 民 每 一 至 兩 年 將 儲 存 在 CD-R 的 重 要 資 料 複 製 一 次 。"
若要大量拷貝,DVD-R省時啊... |
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DVD-R.
I believe the problem for DVD-R may be more serious. |
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Does it have to do with the quality of the CD-R, or simply the limitation of the technology? And which brands and models were those three samples? As with most other man-made products, I suspect the quality has a lot to do with their longevity. |
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CD, VCD, DVD........ are all not as permantant as we expected from my experience.
I keep my CD, VCD, DVD......... in very good conditions, Without Scratches, without mold, without finger print, etc. However, I have the following experience.
Many of my Movie and Opera DVD cannot be played anymore after 3 to 5 years. I get some exchanged by the producer but most of them are just total lost. VCD can be store longer in my experience.
About 5 mucis CDs cannot be played again without any reason after about 10 years.
some of my very old scanned photos or slides on Kodak Gold CD-R cannot be read any more after 5 years or more without any obvious reason.
I believe different brand get different performance but still have a shorterlife than my expectation before. |
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>2001 年 測 試 了 30 款
so samples not 3 samples. |
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So, according to these infomation, the colour of the disk has nothing to do with quality, as many suggested gold disk was better than blue etc. |
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The reflective layer is nothing about the dye itself. But it is clearly that 24K gold disc has the best reflective surface in terms of longevity. The dye itself can"t be recognize without the reflective layer and yet, I think the reflective layer also mean something to the liftime. In Audio CD, hifi-er already know clearly that the aluminium sheet should not be expose to the air and the clear plastic should cover till the edge of the Al-sheet. This is also true to the reflective layer. It will soon be oxidized! And I have some "Silver" disc also turn yellowish and uneven color density in centre to edge. This is how Kodak grade there 24K Gold CDR, that is 217year of lifetime! http://www.cd-info.com/CDIC/Technology/CD-R/Media/Kodak.htmlFew points about the test are meaningful. That is the CD-ROM reading ability, methodology and storage condition do matter about the lifetime result. And it clearly point out that just buy unreadable is equal to meaningless as CD-ROM from different brand use different method to read and correct data. So back to the test above, I doubted that is it scientific enough.... This site contains the rough translation of the original magazine. http://www.cdfreaks.com/news/7751 |
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so...hd w/o bad sector last longer ??? |
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The length of the life can only be estimations. The inventions of CD have not be more than 30 years. So no matter what test, you need to have some methods to accelerate the aging of the CDR. It does not necessary reflect the truth.
217 years? No CD are being stored more than 30 years in real worlds. |
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HD用MAGNETIC方式記錄, 十年唔轉, 可能已經被地球磁場同化.
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我都試過燒隻碟年幾後用變左白碟,唔知可唔可以rewrite呢 :p |
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MO會否好一點? |
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Japanese said DVD-Ram is the best among longevity. |
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Japanese always said that they are the best. But none of there product and creation last more than 20 years be still compatible.
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But none of there product and creation last more than 20 years be still compatible. >今日講既係今日既事,聽日已然係另一回事啦,好似果時咪講到VCD天下無敵,後來唔洗一陣就出左DVD,VCD沈淪為$15隻,仲要特登壓特D質素,仲衰過錄影帶~!可能係特登拉大VCD同DVD既距離..... |
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MPEG FORMAT唔係日本發明.
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衰左=_= 一時考究到係咪日本仔發明,不過唔緊要,其實我都係想講個point,係邊個發明都冇所謂 |
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最長命既, 我估係VHS制式, 應該係JAPAN VICTOR與及NATIONAL等日本公司共同研究, 用來對付SONY既BETA帶制式, 結果BETA就PK左, 連中間既VIDEO 8都PK埋, 現在有(MINI)DV及DVD-R, VHS都仲係非常普及, 與RCA/PHILIPS發明既CASSETTE TAPE有得比. 不過CASSETTE帶應該比MP3頂得好死. 至於VHA玩得幾耐, 以DVD-RW即時錄影機的普及情況, 三年內可能收皮, 因為大陸既DVD-RW錄影機, 已經好平, 2小時碟亦係$20一隻, 與錄影帶唔係爭咁遠.
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