DVDs are just the same as CD-ROMs very unreliable for storage, I use a two disks NAS, not RAIDed though
DVD's are also a problem when it comes to speed and quantity. The DVD drive really struggles to open if you are using thumbnails to search. There is also the problem that one is having to use one DVD for each shoot. But having had in the past a hard drive corrupt itself, before having a second one, DVD was my saviour. But I do wonder what is going to happen in the future. I have boxes and boxes of negs going back to pre WWII, all safe and sound. But will there be copies of digital images of today around in a readable form in 50 years time? but that is another debate, but it is also why I do as I say print a selection of hard copies and store them away. To me that is the only safe way
That is exactly the problem MaoZhu. I do love the things one can do with digital but it is the archiving process that causes the biggest headache for me. I remember searching through my late grandmothers belongings when we were clearing her house and found lots of negatives taken during the war years around Southend in Essex, also pics of me when I was a nipper in the early 1960's. But I'm sorry to say there is no way that digital files are going to last that long. Although having said that I think Digital imaging is really still in the early years and something may come along that increases the longevity of the files.
I keep seeing people have problems with optical media, I guess I'm lucky in that I've not had problems for years. In the early days of CD/DVD burning there were issues but I've not had problems for a long time, although in part I use good media (TDK / Maxell) and never burn at the highest speed (and always perform full verification).
Apparently their longevity can be increased if kept in a cool/dark location (much like film).
But I'm sorry to say there is no way that digital files are going to last that long. Although having said that I think Digital imaging is really still in the early years and something may come along that increases the longevity of the files.
Of course they will - its the storage medium that decays or becomes unreliable not the actual file. Storage media exponentially improves and so every three years or so you can replace what you used previously copying all the files across. Make multiple copies and constantly update them and then replace every three years and there is no reason why digital images should not last forever.
Film negative and print does however decay, there is usually only one copy and if something catastrophic happens, that is the end wheras with digital, provided you manage how and where you store, you will still be able to retrieve