Subj : UBCD4WIN Issue
To   : ROBERT FOWLER
From : JEFF GUERDAT
Date : Wed Sep 28 2005 07:46 am

On 09-27-05, ROBERT FOWLER said to ALL:

RF>As a last resort, I put the CD in my laptop and used Xandros to copy
RF>the disk to the hard drive.  This succeeded, and I was then able to
RF>complete building the .iso image and burning it to disk.

RF>I still have no idea why Windows wouldn't copy the disk and Xandros
RF>did.

It's been my observation that any particular disc may not read in any
particular drive.  When I find one of these (usually written but sometimes
stamped), I use as many of the 8 different drives I have here as needed to get
through the problem area.

An old story - when I was working in Kodak's high-speed CD writer project (6x
was considered high-speed back then) I came across an audio CD that wouldn't
successfully read the last track.  I then used the Phillips 2x writer to do
the job.  When I informed the team that I could use the Phillips drive
successfully but not the Kodak one all hell broke out (no way Phillips was
gonna outdo us!).  It turns out that the disc had a scratch in the top printed
layer which lowered the reflectivity below the threshold set to detect a
useful signal.  Cranking the threshold down allowed the drive to read it fine.
They even bought the CD from me since it's so hard to think of all real world
defects that can pop up.

That's a long way of saying that it's a hardware problem, not software.  You
happened to put it into a drive that allowed you to read the damaged spot
where the other ones wouldn't.  BTW, writers usually have enhanced ECC
capabilities compared to run-of-the-mill readers...


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