16x DVD+/-R: Fact or fiction?
Posted by Trixter on January 10, 2007
Now that the MindCandy Volume 2 is finished, it’s time to archive the project and get all 550 gigabytes of it off of the video rig so that I can completely retrofit the rig with service pack 2, new drivers, the works. Compressed, it will fit onto about $20 of DVDs, so I decided to kill two birds with one stone and buy some 16x DVD-Rs and some 16x DVD+Rs to see which is faster.
The results are disappointing. They both suck, never coming anywhere near the rated burn speed until the very end of the disc (which is the last place you need speed).
Back when the DVD format wars were new, one of the major differences noted between the formats was that DVD+Rs burn at CLV (Constant Linear Velocity, where the disc slows down toward the outer edge so that data is burnt at the same speed “under the laser”), while DVD-Rs burn at CAV (Constant Angular Velocity, which means the disc spins at the same rate throughout the burn). CLV burns slower, but supposedly results in a higher quality burn. So you would think that DVD-R would spank DVD+R in terms of speed, right?
Wrong again. Burning 100 meg shy of a full disc, here are the numbers on my LITE-ON DVDRW SHW-160P6S PS0B:
- 16x DVD-R (Disc ID: RITEKF1): Average Write Rate: 15,208 KB/s (11.0x) – Maximum Write Rate: 21,779 KB/s (15.7x). Burn completed in 6m29s.
- 16x DVD+R (Disc ID: RICOHJPN-R03-04): Average Write Rate: 15,208 KB/s (11.0x) – Maximum Write Rate: 21,792 KB/s (15.7x). Burn completed in 6m20s.
They’re the same! Worse, the best you can do with a 16x drive feeding it 16x media is really 11x. At that rate, I’ll just keep buying 8x media; they cost less, but only take 80 seconds longer to burn.
So, what’s the point of 16x again?