This was a very helpful explanation, Godfrey, for me too. Big thanks! Christine
----- Original Message ----- From: <[EMAIL PROTECTED]> To: "Pentax-Discuss Mail List" <[email protected]> Sent: Wednesday, April 02, 2008 12:38 PM Subject: Re: Lightroom 2.0 beta > Thanks for the explanation, Godders. I think I'll add at least another > terabyte of hard drive space and create hard drive backups to supplement > my DVDs. Most of my film scans are stored on CDs, and they still read > well. The best are on hard drives as well. Unfortunately, I have several > hundred thousand negatives I haven't scanned, many of them worthy. But, > like you, I probably never will get around to scanning them. I do look for > something fun once in a while, like a thirty year old shot of my kids, and > scan it. But I can't see making a major effort. Not enough time in one > life for that. > Paul > -------------- Original message ---------------------- > From: Godfrey DiGiorgi <[EMAIL PROTECTED]> >> The issues with optical media longevity are related to corrosion/ >> fatigue of the dye or foil substrate upon which the bits are encoded. >> Commercially produced audio CDs/DVDs are pressed and encased, >> promoting better longevity of the media, and they're not as sensitive >> to bit-errors. CDs and DVDs produced in a burner encode bits as >> essentially a set of burned spots in a dye laminate substrate and >> have a shorter life span. >> >> That said, I have CD data media that I wrote in 1995 which is still >> 100% useable. Data DVDs are as yet pretty young, but I have several I >> wrote in 2003 (now five years old) which are still in perfect >> condition. When stored and cared for properly, a decade at least is >> not unreasonable to expect in life span. >> >> But what this does imply is that the basis of digital archiving is >> replication, replication, replication. Digital information can be >> replicated infinitely at no loss ... it's just numbers. My primary >> backup system is sets of twin hard drives now, just added another >> terabyte drive to the array. Making another duplicate is as easy as >> "copy disk A to disk B", go away for a day. Run a file system check >> every now and then to be sure nothing has become corrupted. I >> consider DVD and CD storage archives as a secondary, backup archive >> only. They're too small and too inconvenient to handle in volume. >> >> I have 260,000 image files in my archives at the moment, growing by >> 200-300 per week on average and stretching back to 1976 from scanned >> film. There are several thousand negatives I haven't scanned, most >> likely will never be. I can find anything that was digital capture or >> scanned in a few minutes, but finding what's useful in the film >> archive is a huge job ... and film continues to deteriorate no matter >> what I do. >> >> Godfrey >> >> >> >> On Apr 2, 2008, at 8:47 AM, [EMAIL PROTECTED] wrote: >> > I have music CDs that are over twenty years old and still play >> > well. I don't know if that's the same as a data CD. I have checked >> > some of my earliest picture file DVDs, which are about five years >> > old. Thus far, they're all fine. Is there a technical explanation >> > for why these storage devices wouldn't be semi permanent? The files >> > can't fade or walk away. At least not so far as I know. >> > Paul >> > -------------- Original message ---------------------- >> > From: Xavier Cremaschi <[EMAIL PROTECTED]> >> >> Be careful, a cd lives for 10 years, a dvd for less than that (5 >> >> maybe) >> >> >> >> http://le-gall.net/sylvain+violaine/blog/index.php?2007/10/21/31- >> >> reading-a-10-ye >> >> ars-old-cd-r >> >> >> >> [EMAIL PROTECTED] a écrit : >> >>> I do back up to DVD. I have several hundred in storage. My five >> >>> drives give me >> >> over two terabytes of space. They're about 70% full now. I'll add >> >> another 500 >> >> gigs soon. I keep very few backups on drives, save temporary >> >> backups for >> >> important jobs. The general backups are almost exclusively on DVD. >> >>> Paul >> >>> -------------- Original message ---------------------- >> >>> From: [EMAIL PROTECTED] (Ralf R. Radermacher) >> >>> >> >>>> <[EMAIL PROTECTED]> wrote: >> >>>> >> >>>> >> >>>>> I do work on a Mac, but I doubt that makes a difference. >> >>>>> >> >>>> So do I. >> >>>> >> >>>> If you get along with 5 hard drives, you just don't have enough >> >>>> picture >> >>>> files. :-) >> >>>> >> >>>> The problem some of us are having is that we have so much stuff >> >>>> that we >> >>>> need to keep some of it (the vast majority in my case) on external >> >>>> drives which aren't connected all the time or on removeable media. >> >>>> >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow >> the directions. > > > -------------------------------------------------------------------------------- > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
