After two years, all data recorded on the CD-R will be lost.

=== Cut === After two years, all data recorded on the CD-R will be lost. Research from the Danish computer magazine PC Active have shown that the actual lifespan of most CDs with write-once (CD-R) does not exceed two years, while Many manufacturers write on the packaging “data shelf life - 100 years,” writes the Independent. This is due to the fading of the synthetic dye, used in the active (registering) layer of the CD-R. It is in This layer is burned through so-called “pits” by a laser, and it is Information is then read from it. Dark areas are perceived as “1”, and light, unburnt ones - as “0”. If the active layer fades and darkens, then the difference between burnt and unburned areas are leveled and information is lost. The magazine conducted the following experiment: in 2001 tested 30 CDRs from various manufacturers, then closed them in a dark box and tested again in August 2003. 10 percent of disks refused to be read. Moreover, these observations was confirmed by a stream of letters from shocked readers who shared their sad experiences. The same fate awaits DVD-R, using a similar recording layer, the editor believes magazine Jeroen Horlings, which plans to will soon publish the results of testing theseinformation carriers. Gordon Stevenson, director of Vogon International - company, specializing in data recovery - I agree with conclusions of PC Active, based on our own experience. One of customers contacted the company with a complaint about the CD-R being unreadable, recorded six months ago. “The active layer has darkened,” said Stevenson, "but we were able to recover most of the data." "The time period stated by manufacturers is unrealistic. If you spend It's only 20p for something, don't expect it to last 100 years,” emphasized the director of Vogon International. Stevenson also noted that CD-Rs, especially cheap ones, extremely sensitive to sunlight, increased humidity and surface damage. Almost all experts agreed on what to use CD-R is not practical for long-term storage of information. One of the leading CD-R manufacturers, Imation, stated that that I have not heard about the problem of aging in relation to my discs. A company representative explained that, subject to proper storage and careful handling, the service life of the disk can range from 30 to 200 years, but recommended storing important archives on DVD. Not all optical media are so vulnerable. Rewritable discs (CD-RW) are produced using slightly different technology,the recording layer is made of a metal alloy and located between two protective layers. Also resistant to influence of environmental factors on magneto-optical disks. URL: http://lenta.ru/science/2004/04/21/cdr/ Write to us: info@lenta.ru Copyright c 2004 Lenta.Ru License of the Ministry of Press El? 77-4400 Hosting - Rambler Telecom Lenta.Ru === Cut ===

Press RESET immediately, Wladimir Bulchukey! On Thu, 22 Apr 04 20:51:21 +0400, Wladimir Bulchukey wrote: WB> Not all optical media are so vulnerable. Rewritable WB> discs (CD-RW) are produced using a slightly different technology WB> the recording layer is made of a metal alloy and There is nothing more reliable than GMD-130 produced by IZOT in disk drive type 5305...

Don't slaughter the cash cow that lays golden eggs, Kirill...! 24 Apr 04 00:19, Kirill Frolov -> Wladimir Bulchukey: KF> There is nothing more reliable than GMD-130 produced by IZOT in KF> disk drive type 5305... But not ISOT. And Kiev NPO "Electronmash". Izot is a Mini-Disk from Bulgaria, it absolutely sucks. The worst thing is the Dialogue and IVK floppy disks. They even include viruses and Trojans don't stick. /ps: the last phrase is a joke in the KF style :) . With the best - Wlodek # wlblack(@)newmail.ru # http://wlodeks.narod.ru [ZX] [500:95/462@ZXNet] [2:5016 Forever] [Golyanovo] [Old Russians]