Quad Density CD-R writers? 18
GeoffM asks: "It seems strange that no company is making Double Density or Quad Density CD-R writers/readers. Most storage mediums tend to make these leaps. Why haven't CD-Rs? Given that CD-R media prices are dirt cheap a higher density standard would be very popular. With 2.8GB of storage and MPEG4 encoding a person could easily record full length movies/tv/home video on a CD-R that costs less than 50 cents! Are the new blue lasers too expensive? I'm tired of waiting for DVD recordable AND I'm not looking forward to the cost of blank DVD media. What's your take?"
problem (Score:3)
OK, say you get a shorter wavelngth laser or something to increase data density. That's great an all, but until other drives (other manufacturers, regular cd-roms, etc) support the new laser/format, the written media is basically only readable by people with that exact drive.
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Re:problem (Score:2)
I remember reading something a while back about doing this with DVDs: different color lasers, and different wavelengths. I assume this is the same principle that would be applied to CD media
I think you've found the answer.. (Score:1)
Think you might have stumbled onto the answer to your own question (-:
That may be PRECISELY the reason we haven't seen quad density CDRs.
Re:problem (Score:2)
well, there is ISO 9660 which defines the regular cdrom file format. I don't know if that specifies down to the physical layer though.
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DVD (Score:1)
FMD-ROM? (Score:1)
I'm still waiting for FMD-ROM!
Vapor-ware for 2000?
perhaps in 2001 it will become real!
Thnx,
Fuller
check out http://www.c-3d.net
It would compete with RW DVDs (Score:1)
Lots of people are making something analogous (Score:1)
Consider this page [toshiba.com] at the Toshiba Storage Devices Division [toshiba.com] which talks about DVD-RAM; A rotational media quite similar to CD-RW (except that DVD-RAM involves the manipulation of magnetic media, sort of like magneto-optical.)
There's a good reason for no quad-density CD-RW's. (Score:2)
The optical storage industry went through the same thought process. They decided that they could make multi-layer disks at the same time. And they came up with DVD's.
Your idea is just about the same as a DVD. In both cases, you need a second laser and a more accurate focusing assembley.
Besides, by the time that such a quad-density or dual-density CD-RW would be developed, DVD-RW, DVD-RAM, or DVD+RW would be on the mass market. I just hope that SOMEBODY blinks and that at least one, hopefully two, will die.
Or maybe the FMD disks will take over. That would be nice, but I've seen similar promises before that haven't actually panned out.
DVD started out as roughly quad-density CD (Score:2)
Among its many other improvements, the DVD uses a shorter wavelength laser and more precise beam alignment for greater pit density, but also uses a more efficient error correction scheme to cram that 4.7GB on a single layer of a 4.5" platter.
However, the real reason you never saw 1.2GB or 2.4GB CDs appear in the marketplace is backward-compatibility. Unlike purely computer-oriented storage media (floppy disks, tapes, etc.), the CD-ROM and CD-R came to computers from the consumer electronics market. The market for a few million double-density or quad-density CD-R(W) drives was hugely outnumbered by the 100 million or more consumer devices equipped to read normal CDs.
In other words, nobody cared enough about double-density or quad-density CDs to bother making them. The enormous installed base of CDs virtually assured that they wouldn't be replaced until something compelling came along to require greater storage density. DVD movies were the killer app which got DVDs invented in the first place. And even with that, DVD-ROM still hasn't really taken off as a computer media format. Rewritable DVD drives will finally kill off the CD-RW in a few years.
Re:problem (Score:1)
Okay, let's discount this community - we're not what you might consider 'normal'.
Average Joe user who has a need for a CD-R (or happens to buy one bundled in their latest Gateway purchase, like my in-laws who call me every other day for advice) doesn't have more than one computer. They would probably use it to backup something, then only when they needed that data again would they use that disc.
Perhaps I'm overlooking something but even so with the advent of DVD-R what's the need for Quad-Density CD-R?
Re:There's a good reason for no quad-density CD-RW (Score:1)
Double-density has already been done (Score:1)
It was reported on Slashdot a while ago ¥I can't find it in the older stuff though, and you can read about it on the CDR-Info site [wwwcdrinfocom]©
I also think that the reason it hasn't done well is pretty obvious, and that's because just double ¥or 4x the capacity isn't enough for some people, and it still involves buying a new drive and media which will be obseleted as soon as DVD-R/DVD-RW/DVD+RW/DVD-flavour-of-the-month becomes cheap enough to be more viable as a backup method©
Re:problem (Score:2)
This community, and the community of warez/gamerz/hackerz. It's "free" software, either way :-)
They would probably use it to backup something
If that was the case, few people would need a CD rewriter. I'd say people typically use them to burn music CDs (my family wants me to burn CDs for them all the time, as well as MP3s), portable documents (i.e. burn this presentation, take it in to work -- more reliable and better storage than floppy), or illegal software (even computer illiterates don't like paying for MS products :-)). The number of non-technies who back up anything is quite small, in any case.
I would definately like to get my hands on quad density CDs.
The RIAA doesn't have control yet (Score:1)
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63,000 bugs in the code, 63,000 bugs,
ya get 1 whacked with a service pack,
Re:problem (Score:1)
Probs with Blue diode lasers (Score:1)
Checking some websites reveals there are precious few manufactures making these things.
What is more a clincher though is the lifetime of these deviced is measured in the 100s of hours of usage, which is unacceptable for something that needs to work for hours at a stretch. Aside from the issue mentioned earlier that DVD is pretty much what HD-CD would be, and it's only due to the consumer market that these devices have become realistic for the IT market...
-- kai
wouldn't a quad density cdrom be just like a dvd? (Score:1)