rdgrimes wrote:I presume that the scale in CD Doctor is such that 1000 would be the same distance up from 100 as 100 is from 10.
Yes. That is the characteristic of a logarithmic scale. Similarly, 0.1 would be that same distance down from 1. Factors of 10 (or any multiplicative factor) are spaced evenly on a logarithmic graph.
It looks like your CD Doctor and WSES graphs match well.
rdgrimes wrote:FYI, this is one of the infamous LiteOn bundled RW discs, (came with my 48x burner). It's made by NanYo.
I'll see your junky LiteOn-bundled NanYo and raise you one horrible Memorex/LiteOn-bundled Infodisc CD-RW disc:
WSES - Note that the C1 scale goes up to 2000
, but the graph is still clipped
CD Speed Scan Disc
The peak error rate exceeds 2200 C1 errors per second! What garbage! A file comparison using CDCheck shows over 50 corrupted files. Dodecahedron, if you are reading this, this is the type of terrible performance that soured me on CD-RW discs several years ago, and continues to make me wary of them. It is also why people say CD-RW is less reliable than CD-R.
Anyway, you can see that CD Doctor and WSES again agree very well, and CD Speed's Scan Disc function also agrees qualitatively.
rdgrimes wrote: The gaps interest me, also the doctor has several times given me a graph that is blank on one half.
In my tests both programs show, at the beginning of the disc, those gaps that you noticed (in WSES the gaps are bridged by a straight line as the graph skips from one actual data point to the next). I don't know, but suspect that these gaps are caused by the disc being so bad that the laser loses lock and skips over sections of the disc.
I also captured one of those half-blank graphs you saw, in both CD Doctor and WSES:
Perhaps this is caused by a corrupted TOC in the lead-in area. The beginning of the disc where it is located has the most errors of all. WSES did report seek errors a couple of times while I was trying to test this disc.
Apparently both the gaps and the truncated graphs are a characteristic of the drive and the bad media, not of CD Doctor, since these effects show up on both CD Doctor and WSES.
In summary, I have been able to duplicate the anomalies you saw. However, these anomalies are not unique to CD Doctor. They show up in both CD Doctor and WSES. Also, these anomalies only show up on discs that have such terrible quality and massive errors that they are well outside the range of allowable CD specifications. By the time these anomalies show up in either program, the disc is already so far gone that files stored on the disc are corrupted and the disc is already circular file fodder. Trying to characterize the error rates would be akin to polishing the silverware on the Titanic - there just isn't much point to it.