Originally posted by xhepera
[B]In the speed box, what value should I be using?[/b]
"Max" speed is usually used to place the greatest stress on the read procedure. This will show the most errors, giving an indication of the readability of the disc under a demanding condition. The lower the read speed is set, the fewer errors will be reported.
I'm still confused about the number of C1 errors that I should consider "accepatable."
There is no absolute number of C1 errors that are acceptable as such. The C1 error "max" amplitude and average rate are more significant. The acceptablity of C1 errors is a value judgment based on conditions and intended usage. As indicated above, just lowering the read speed can reduce C1 errors. Commercially produced discs may contain higher levels of C1 errors than would be acceptable to a home recordist as long as no C2 errors are present.
The information at Media Quality Error Limits may be used as a starting point or rule of thumb. Although the reported error results of KProbe are not specifically defined as BLER, the BLER grading in the link is close enough to KProbe results to be useful as a guide. Technically, BLER (block error rate) is the number of errors per frame per second averaged over 10 seconds when reading at 1x. Standards allow commercially produced discs to have a BLER as high as 220 as long as no E32 errors are present. This is an unacceptable error rate for home recording.
C1 errors and BLER are different measurements, but for your purposes you could substitute C1 for BLER in the link above to get a starting point for disc quality standards. The information at Disc Grading System - BLER is also useful for establishing guidelines and correlates to the first link.
A low C1 error rate is always desirable, because high levels will be quicker to degrade to C2 errors. The primary rule for the home recordist is that no C2 errors are acceptable.