> >One thing that Tony didn't tell us was what he used to burn the CD.
> >If you extract and burn with EAC, then you should set a read and a write
> >offset. Once those are correct, you will be extracting exact copies.
> >
> >If you extract with EAC but burn with something else, you must use EAC's
> >combined read/write offset...and you will never get exact copies.
They'll
> >be damn close (having missing or repeated samples)...but never exact.
>
> Now, this gives me pause, because when I did a "compare WAV" with EAC, it
> reported no differences. I wrote the disk using Adaptec Easy CD Creator
> 4.02d. Does EAC not compare every single byte, or does "never" here
really
> mean "90% never"?
I don't think what Rama (Jeff Silverman) said at the top here is entirely
correct, and what T Pulokas experienced is common (and does indicate an
exact copy was made, of that track anyway).
If you use another burning software to burn audio after extracting with EAC,
you will produce an exact copy of all tracks but the first or the last
track, depending on whether or not your read sample offset is a positive of
negative number, and whether your drive supports overreading into the
lead-in or lead-out. The proof is in the pudding...do this test:
1. extract a shn set to wavs.
-Best to use one disc of a show here.
-Take note of whether these shns have seektables or not, you'll need
this later.
2. burn those wavs DAO.
-Use whatever burning software you normally use.
3. extract those tracks using EAC
-Put them in a new directory/folder.
4. rename the tracks as they were named as shn files
-Track01 becomes jgb87-08-29d1t01 (for example)
5. re-shn those newly extracted wavs
-Make sure you have them in a clean directory to avoid md5 confusion.
-Make sure you have seektables set on or off, the same as the orignal
shns.
6. go get the orignal md5 and run it against the new shns
Every time I do this the last track fails the md5. Some say it's a glitch
EAC has with the last tracks. I think it's caused by a combination of my
offset being a positive number and my drive not supporting overreading into
lead-in lead-out.
Anyway, this is a definitive test. If the md5s pass, you've got yourself a
clone there mister. Simple as that.
I WOULD NOT RELY ON THIS METHOD. ARCHIVE YOUR SHNS. Archive your shns
people, save us all a lot of time and headaches. No one wants your DAEd,
re-shned sets. That's why we have a shn circ page, so we can avoid the
bastardized copies that cloud our otherwise clear waters.
Hope this helps some folks,
Jake
WOB - This is NOT a waste of bandwidth, but is instead very useful
information for the group as a whole. That being said, I've got a new box
that burns CDs mighty fast, so if anyway wants a shn b&p, just let me know.
http://db.etree.org/jakemerc
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