Re: Offset question/suggestion

From: "David W. Tamkin" 
<cdoffsets-jwJhHqWfV//jmYe+YMriwxL4W9x8LtSr@xxxxxxxxxxxxxxxx>
Subject: Re: Offset question/suggestion


The twenty figures reported by EAC were these -- can you believe the spread?
My burner is a TDK CDRW401248UEX.

-1784
-1410
+300
+428
+433
+669
+688
+688
+688
+688
+688
+688
+790
+1282
+1486
+1893
+1991
+2130
+2169
+3898


According to the FAQ, the fourteen values that are not +688 must come from,
guess what, different pressings that somehow have the same ID code but are at
non-zero offsets from the pressing that EAC expects.  It was quite a stroke 
of
luck that any value showed up more than once ... or maybe it was a stroke of
luck that only one value occurred more than once.

This was to be expected. It comes from the fact that the number of possible 
offsets is bigger than the number of pressings for a given CD. 
Trying more and more CDs with different offsets, you will first come across 
some the are the same pressings as the reference one, and these will all 
return the same value, while the number of tried CDs is still far too small 
to come across same other offsets by chance, granted you always try different 
titles.
If you tried several times the same albums, then you should get also 
different values several times.

> If you want to know your separate OCVs, you
> burn a small test .wav available for download or the EAC offset test track,
> learn your combined OCV in the process, and then send the disc to one of 
> the
> testers.  The volunteer tester rips your track with his/her correct read 
> OCV,
> figures out your write OCV, and emails it to you.  You subtract that from 
> the
> combined OCV that you already figured out, and you know your read OCV. 

This is automated in EAC since years : it is the "offset test CD".
A volunteer knowing his offsets just burns one and send it to anyone wanting 
to know his/her offset. This person in turn sends some to someone else...
If it is the one who asks who must do the first step, then he can send a 
blank to a volunteer, the volunteer burns the offset test CD on it, and sends 
it back.

Pio2001


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