In article , Iain Churches
scribeth thus

"Eiron" wrote in message
...
On 18/02/2017 12:00, Iain Churches wrote:
"Vir Campestris" wrote in message
o.uk...
On 17/02/2017 09:42, Iain Churches wrote:
A bad pressing? I like that :-))

I did have one once. It so happened we had a CD tester at work, and it
showed multiple errors scattered all over the surface. I contacted the
manufacturer, and they sent me a new disc. Pressed somewhere else... I
don't know if they did anything with the tester report I sent them.

:-))

Did the multiple errors affect the replay, or prevent
the disc from playing? Quite often they do not.

CD plants produce in "lines", so the replacement disc does
not have to be made somewhere else just on a different line.

A Reed Solomon reader (probably like the one you had at
work) is used for QC. One of these two gentlemen
(Reed or Solomon) is quoted as saying "without error
correcting codes digital audio would not be technically
feasible"

Which is complete bollox.

Anyway, a CD will play perfectly even after drilling a few 2mm holes in
it.

Indeed it will.
It is the error correction which makes that possible.

Do you remember Keith G who was one of the more
"interesting" subscribers to this group some years back?
When the drilling of small holes in CDs, and the fact that
they still played, was mentioned. He wrote: "That' nothing!
Every LP I own has a much bigger hole, and right through the
centre. The only error correction they have is an occasional
wipe with a DustBug. and they all play perfectly"

:-)

Iain



Yes met him at home once bought a brace of QUAD II's off him. Was a real
character Keith he had a sort of bedroom with most of the gear in, all
units piled on top of each other not an audio purist by any means but
very much an enthusiast, and that in abundance!.


Been dead now some time, lovely bloke and his wife Swimm was she
called?..
--
Tony Sayer