Dual Layer != Double Layer

The Pioneer DVR-109 now supports DVD-R DL disks, although I confess that I was one of the ignorant regarding the nomenclature you bring up.

http://www.pioneeraus.com.au/computer/dvdwriters/dvr109/

 

Do you honestly think it matters? Even if your distinction is accurate, there's no way, in common communication, that people are going to keep it straight. Using dual vs double doesn't add or detract from the information being conveyed, i.e. it's a useless distinction. It's basically a happy vs glad thing. Pick one. If you want to be pedantic, fine, but you'll find yourself in a very small, ignored minority.

 

Right, until you buy some dual-layer blank DVD discs and try to use them in your double-layer Mac !!

 

The terminology is indistinct. The +R, -R is something that still needs to be a descriptor. The organizations that have created these terms have used them semi-interchangeably. The term dual and double can precede a +R or +RW disk (as noted in the press releases above, also see the same source for white papers). I see the same for -R, -RW, so regardless people still have to specificly the kind of media they need, including the +/-. If it was really ment as a delination, then the terms should not be so simular, or as interchangable.

 

I didn't say a thing about +R or -R, did I? That's the only distinction that counts. Use double or dual as you please.

 

From an article re: a Sony drive.

Double Layer vs. Dual Layer


There are currently two formats on the market that support recording to two layers of a DVD disc. The first was presented by the DVD+RW Alliance for the plus ("+") format and given the formal name "Double Layer." The DVD Forum followed with its own standard for the dash format ("-"), which it dubbed "Dual Layer." For now, drives are only available in write-once formats called DVD+R DL and DVD-R DL.