Film-Tech Forum ARCHIVE: Difference Between DVD-R and DVD+R

This is topic Difference Between DVD-R and DVD+R in forum Film-Yak at Film-Tech Forum ARCHIVE.

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Posted by Richard Greco (Member # 2032) on 03-31-2004, 06:47 AM:

What's the difference between DVD-R and DVD+R?

Posted by Leo Enticknap (Member # 534) on 03-31-2004, 07:48 AM:

AFAIK, absolutely nothing except a code pre-written onto each disc to signify that it is one or the other, thereby making one guy's disc incompatible with the other guy's player in order to force you to buy the hardware manufacturer's approved media. There can't be any significant difference, because you can now get drives which will write both.

Posted by Daryl C. W. O'Shea (Member # 1303) on 03-31-2004, 07:59 AM:

DVD+R supports dual layer burning if you can get your hands on hardware & firmware to make it happen.

DVD-R/RW is supported by the DVD Forum, DVD+R/RW is not (yet).

Last I checked, approximately 91% of DVD players support DVD-R, while 84% support DVD+R.

Posted by Stephen Furley (Member # 1277) on 03-31-2004, 08:05 AM:

There's a bit more to it than that, but I can't remember the exact details, and which is which. The differences are fairly minor, but enough to make the two formats incompatible for writing, unless the writer is specifically designed to handle both. Why on Earth couldn't they have resolved these differences, and produced a single standard before they reached the market.

To make things worse, there are two versions of DVD-RAM, the original one with 2.6GB. per side, and the later one at 4.7GB. There are also two versions of DVD-R, for Authoring and for General, though the former is much more expensive, and little used now. There was also an early version of the authoring type which had a smaller capacity, 3.something GB. I think, and one version each of DVD-RW, DVD+R and DVD+RW. A total of eight formats.

www.dvdmystified.com has details of the differences.

Posted by Daryl C. W. O'Shea (Member # 1303) on 03-31-2004, 08:16 AM:

DVD R supports lossless linking and both CAV (Constant Angular Velocity) and CLV (Constant Linear Velocity) writing.

DVD-R only supports CLV.

DVD-RAM (an entirely useless format) uses zoned CLV, similar to a hard disk.

General DVD-R discs are encoded to prevent writing CSS encoded material, Authoring discs aren't.

DVD R also supports more funky laser controls.

It's all pretty much useless information though... just go buy yourself a Pioneer A07 and you'll be happy. Even if you're not looking to buy a drive.

Posted by Richard Greco (Member # 2032) on 03-31-2004, 11:38 AM:

Thanks For The Info