Re: Harvey Norman CD-Rs: Chemistry Capacity
I was still curious and did a short web search on my CD-R questions. On Sat, 28 Sep 2002, Helmut Walle wrote: ... Disk type:Short strategy type (Phthalocyanine or similar) ... Phthalocyanine sounds quite toxic to me... And what is Short strategy type anyway? Have I overlooked this before with the other CD-Rs I have used so far? ... From http://www.osta.org/technology/cdqa.htm What is the Orange Book, part III? The OB III defines CD-RW media in terms of physical characteristics and in terms of playability and recording characteristics. Laser write strategies are defined, allowing CD-RW drive manufacturers to produce drives that can read this new CD media. So there are physically different CD-Rs, and the drive will treat them accordingly. The short/long strategy refers to the timing when switchin on/off the laser to write the CD. And http://www.cd-info.com/CDIC/Technology/Terminology.html#phthalo phthalocyanine An organic dye used to form the data layer in some CD-Recordable discs. Mitsui Toatsu Corporation holds the patent on this dye, but has licensed its formula to some other manufacturers. And finally if you would like to know after which time you can expect the data on your CD-Rs to start rotting: http://www.cd-info.com/CDIC/Technology/CD-R/Media/Longevity.html Cheers, Helmut. ++ | Helmut Walle | | [EMAIL PROTECTED] | ++
Re: Harvey Norman CD-Rs: Chemistry Capacity
On Sat, 28 Sep 2002, Helmut Walle wrote: Hi I just put one of the el-cheapo CDs into the drive, and cdrecord says Disk type:Short strategy type (Phthalocyanine or similar) My understanding is that this means short term storage only. Phil. -- Philip Charles; 39a Paterson Street, Abbotsford, Dunedin, New Zealand +64 3 488 2818Fax +64 3 488 2875Mobile 025 267 9420 [EMAIL PROTECTED] - preferred. [EMAIL PROTECTED] I sell GNU/Linux GNU/Hurd CDs. See http://www.copyleft.co.nz
Re: Harvey Norman CD-Rs: Chemistry Capacity
On Sun, 29 Sep 2002 21:33, Philip Charles wrote: On Sat, 28 Sep 2002, Helmut Walle wrote: Hi I just put one of the el-cheapo CDs into the drive, and cdrecord says Disk type:Short strategy type (Phthalocyanine or similar) My understanding is that this means short term storage only. Got any idea how short term is defined? -- Sincerely etc., Christopher Sawtell
Re: Harvey Norman CD-Rs: Chemistry Capacity
On Sun, 29 Sep 2002, Christopher Sawtell wrote: On Sun, 29 Sep 2002 21:33, Philip Charles wrote: On Sat, 28 Sep 2002, Helmut Walle wrote: Hi I just put one of the el-cheapo CDs into the drive, and cdrecord says Disk type:Short strategy type (Phthalocyanine or similar) My understanding is that this means short term storage only. Got any idea how short term is defined? Not really, but personally I would not trust them for more than six months. A figure that rings a faint bell in the recesses of my imperfect memory. Phil. -- Sincerely etc., Christopher Sawtell -- Philip Charles; 39a Paterson Street, Abbotsford, Dunedin, New Zealand +64 3 488 2818Fax +64 3 488 2875Mobile 025 267 9420 [EMAIL PROTECTED] - preferred. [EMAIL PROTECTED] I sell GNU/Linux GNU/Hurd CDs. See http://www.copyleft.co.nz
Re: Harvey Norman CD-Rs: Chemistry Capacity
On Sun, 2002-09-29 at 22:46, Philip Charles wrote: On Sun, 29 Sep 2002, Christopher Sawtell wrote: On Sun, 29 Sep 2002 21:33, Philip Charles wrote: My understanding is that this means short term storage only. Got any idea how short term is defined? Not really, but personally I would not trust them for more than six months. http://www.medialinenews.com/issues/2001/news/0314/0314.1.shtml Cheers, Rex
Re: Re: Harvey Norman CD-Rs: Chemistry Capacity
AFAIK, cd's only have a usable life of about 30 years before the die, not sure about cd-r's, probably even less. Not that great as a long term backup solution :-( jeremy. From: Christopher Sawtell [EMAIL PROTECTED] Date: 2002/09/29 Sun PM 10:03:35 GMT+12:00 To: [EMAIL PROTECTED], Philip Charles [EMAIL PROTECTED] CC: Canterbury Linux Users Group [EMAIL PROTECTED] Subject: Re: Harvey Norman CD-Rs: Chemistry Capacity Got any idea how short term is defined? -- Sincerely etc., Christopher Sawtell
Re: Re: Harvey Norman CD-Rs: Chemistry Capacity
On Mon, 30 Sep 2002 08:21, Jeremy Bertenshaw wrote: AFAIK, cd's only have a usable life of about 30 years before the die, not sure about cd-r's, probably even less. Not that great as a long term backup solution :-( I have some standard audio CDs I bought about 20 years ago, they still play fine. It's the writeable ones I'm keen to know about. jeremy. From: Christopher Sawtell [EMAIL PROTECTED] Date: 2002/09/29 Sun PM 10:03:35 GMT+12:00 To: [EMAIL PROTECTED], Philip Charles [EMAIL PROTECTED] CC: Canterbury Linux Users Group [EMAIL PROTECTED] Subject: Re: Harvey Norman CD-Rs: Chemistry Capacity Got any idea how short term is defined? -- Sincerely etc., Christopher Sawtell -- Sincerely etc., Christopher Sawtell
