Originally Posted by tux99
Rgb, I agree with your sentiments about printed optical media versus streaming but that has nothing to do with this thread and even with your original question or my reply (or even less so the subject of this thread).
We were purely talking about back-ups, not the source of our media.
I have a wast collection of original DVDs and some BDs, which I know out of personal experience don't last forever. I have already about 3-5% of my 10+ years old original DVDs that are unreadable or skip badly, despite I kept them safely out of sunlight or high humidity or high temperatures (I don't live in a hot or tropical country).
I have also already found several optical writable media from 5-10 years ago that I burned and that are already partially unreadable (a couple of CD-Rs from 13 years ago are completely unreadable).
Because of that and also for play-back convenience I back up all my original media to hard disks (raid5). Since backing up more than 1000 DVDs takes a huge amount of time I don't want to have to do that all over again, so I also back up my raid5 array to plain 2TB external hard disks.
I can't see the use for DVD-R or BD-R, ok they might still be cheaper than hard disks (per GB) but it takes wastly more time to burn to optical media than to copy data to an external hard disk (not to mention the hassle of splitting up the data first and archiving hundreds if not thousands of optical discs).
Yes hard disk die sooner or later, but so far by doing the initial "badblocks -svw" burn-in check of each new disk that I buy (which I mentioned a few times already on this forum), and by RMA'ing those that fail this check, my disks have always lasted at least 5 years (some are even older and still ok) and after 5 years I will want to migrate the data to newer bigger disk anyway.
So I'm curious to know what your strategy is, that involves the use of optical writable discs.
re: "wast collection"- you and Mr. Chekov, I presume
re: backup strategy
3-5% of bad original DVD's sounds like a lot. I've been ripping a large number of my ~8-12 year old original commercial DVD's, and only last week had an unreadable one with a bad spot, which I suspect was manufactured with the defect. So, I'm not experiencing anywhere near 3-5% failure of original pressed DVD's. If you count that one, then maybe .01% (or less) "failure" for me.
I sometimes do random read tests from CD/DVD burns that are 5-15 years old and can't recall any burned discs I couldn't read in a recent vintage drive. Some older optical drives may just be worn out or unable to read burned discs correctly (by design, before burned DVD's became standardized and the burn process debugged, which really wasn't until at least 2004), if the optical drive is >8 years old or so.
Also, the mfg id of blank media makes the BIGGEST difference in disc quality, burn quality and longevity. I only use 1st class media athttp://www.digitalfaq.com/reviews/dvd-media.htm
burned no faster than 4x, though I may start experimenting at 8x.
NEVER, EVER use adhesive labels on a disc of any kind, either before or after burning- they will make the disc unbalanced and drives won't be able to read them reliably due to the wobble, however slight, no matter how precise a label is applied.
For archival backups of stuff important to me, I might burn two backups on two brands of 1st class media, like Verbatim and Sony, +R only, which purportedly has better burn control and track control info on the disc.
DVD's are ripped to hard disk with the latest Fab then either shrunk with DVDShrink or DVDFab, or split into two using the Split funtion of Fab if I want to preserve 100% video quality without reencoding. I use the shrunk/re-encodes for travel, vacation home, wifes' classroom use (teacher) loans, etc.
The DVDFab split function (which separates a dual layer DVD into two single layers DVD's without touching the video or audio) is EXTREMELY fast about 3-4 (or faster) minutes to split a 7.5GB DVD rip from one hard disk to another, as fast as copying the 7.5GB files straight up from one hard disk to another, so this effectively adds no time to the process assuming you rip to one hard disk and move them later anyways.
I do not Verify every burn- just randomly verify every 20-30th burn to ensure the process and burner are still good.
Yes, burning takes time, but I do other things while burning/shrinking, like email, reading /. or digg, making HOWTO's and posts like this
. All machines in the house have a DVD burner (3-4 functional at any given time, not always burning
). Burning over a 100Mbit wired network at 4x has been no issue, so you can burn from the same hard drive the rips are on to several different machines at once over a network- burning two discs at once at 4x is the same as burning one at 8x, but with higher burn quality.
Discs are stored either with the original in a Tyvek sleeve on the side with the inserts of the DVD case, or the original's case is replaced with a 6 disc stackable version like-http://www.shop4tech.com/item5896.html
with the original(s) on top and backups underneath, plus another two discs can fit in a sleeve on the booklet side.
Originals are on shelves in alphabetical order, with special collections separated, i.e. Star Trek, Star Wars, Indiana Jones (in addition to all film release originals, I have all the Young Indiana Jones boxsets
Overflows go into the cakeboxes the blanks came in, sorted by either genre (westerns, horror, etc), actor (Ben Stiller films, Paul Newman films, etc), or director (Speilberg, Wolfgang Petersen, etc).
A 100 disc cakebox might have several actors grouped in the box, separated by one of those clear plastic false discs at the bottom (or top) of a stack of blanks, with a tag made from tape attached with the actor's name on it readable through the cakebox container, identifying all discs beneath the separator.
Cakeboxes effectively become film "canisters" in your "vault"
This media library is kept in a cool, dry, dark basement with relatively constant temp/humidity.
When I feel like a Newman film, I peruse the Newman "stacks", or a Weir film, and so on...
...I'm a Librarian at heart, I guess- call me Mr. Atoz