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Hi Don: The way you describe it is how I've always understood it. My personal experience has been, for years, that 16x is a reliable burning speed for almost all CDR media. My Plextor drives have been known to just not burn certain cheapo media so I never buy it. T-Y and MAM-A media burn great at 16x and I too have found very low error rates using Plextor's software. I don't have a client with sophisticated analysis equipment like Richard's client but I did have one tell me that the audio CDR's I sent him play perfectly on his finicky older CD machine, a unit that usually won't play CDR media. Richard, if you have time, run your tests at 24x, too. I wonder if 24x is perfectly acceptable with modern media and could be a time-saver. As for Don's comment about 1x, I agree with this in most cases. T-Y blue-dyes seem to work OK at 1x in my Tascam CD recorder, exhibiting low but not zero error rates when checked with Plextor software. I should note that they exhibit lower error rates, in general, than commercial audio CD's tested with Plextor. -- Tom Fine ----- Original Message ----- From: "Don Cox" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, January 07, 2008 8:10 AM Subject: Re: [ARSCLIST] CD-R error rates > On 07/01/08, Richard L. Hess wrote: > >> While one CD does not make solid test, this indicates that the higher >> speed produces more errors. >> > Burning a CD is a photographic process. There will be an optimum > exposure for each batch of CDs. > > The stated maximum speed is the least exposure that could possibly give > acceptable results, like the stated speed rating of a traditional > black-and-white negative film in a camera. > > A couple of stops more exposure, corresponding to one quarter the > maximum speed, is more likely to give good results. There will be a > range of speeds over which error rates are low. The intensity of the > laser affects this, and is I believe adjusted by the burner to some > extent after doing a short test burn at the start. > > I would expect error rates to rise with very low speeds such as 1x on > current CD-Rs, as these have been optimised for higher speeds. They > would be over-exposed at 1X, unless the laser intensity is reduced > enough to compensate. > > >> So, looking at it this way, what is an acceptable C1 rate for audio? >> >> I was pleased not to get any C2 errors which Plextor showed in their >> documentation as being acceptable at a low rate. >> >> What are others getting? >> >> I had a client ask me how I was burning CDs earlier this year. They >> have some flavour of Clover analyzer and my CDs were showing lower >> error rates than their in-house CDs--that was a pleasant surprise! >> They are burning HHB blanks in HHB audio burners at 1X. Up until >> tonight, I had burned at 16x ever since I got the Plexwriter CD/DVD >> burners several years ago. >> > > Regards > -- > Don Cox > [log in to unmask] >