CD verify on FC5 disc 5.

Russell Coker russell at coker.com.au
Thu Mar 23 00:19:43 UTC 2006


On Thursday 23 March 2006 08:52, "Eric S. Raymond" <esr at thyrsus.com> wrote:
> Peter Jones <pjones at redhat.com>:
> > On Tue, 2006-03-21 at 22:35 +1100, Russell Coker wrote:
> > > I burned a copy of CD 5 with 800 blank sectors at the end and it worked
> > > perfectly.  I also noticed that CD 2 has the problem (although I hadn't
> > > noticed it before), CDs 3 and 4 don't have a problem (I still have to
> > > repeat tests on CD 1).
> > >
> > > I guess that I can work around this problem by specifying a padsize of
> > > something between 81 and 800 sectors (if some more friends want copies
> > > of FC5 then I'll find out soon).
> >
> > Ok, so... what CD drive do you have, what type of bus is it on, and what
> > controller is in use?

I've repeated this problem on three Compaq Evo 1.5GHz P4 machines.  They have 
an Intel 82845 845 (Brookdale) chipsets with a Compaq CRD-8484B CD/DVD-ROM 
drive.

Incidentally they make great test machines and are going really cheap on the 
second-hand market.  Apart from this CD-ROM issue they have no problems with 
any version of Fedora or RHEL that I've tried.

> I can't answer that question, but I can tell you that the -pad 800 solved
> this same problem for the exceedingly generic ATAPI CD-ROM drive on my
> Opteron box.  This workaround is probably generally applicable, and I'm
> going to put it in my Fedora Core customization FAQ.

The number required is probably a lot smaller than 800, I will do more tests 
next time I burn CDs.  But OTOH 800 sectors is 1.6M and there's enough space 
to spare.

For reference I had discovered in that past that 50 spare sectors was the 
minimum to guarantee that no CD-ROM drives in my test network would fail the 
media verification (disks with less than 50 spare sectors failed verification 
and would sometimes fail on an install), so I chose 80 sectors to be on the 
safe side.

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