| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1407.1 | Pin Holes Common | USRCV1::THOMPSONP | Paul Thompson, Rochester, NY | Sat Nov 26 1988 11:43 | 5 |
| I believe that you will find that it is the exceptional CD which won't
show any pin holes when held up to the light. I have yet to encounter
one of these pin holes which affected the sonic quality of the disc
in any way. (My current collection is probably around 130 discs.)
|
| 1407.2 | The Hole in the Zero | MARVIN::BIGELOW | Bruce - DECnet-VAX | Mon Nov 28 1988 10:14 | 19 |
| I have 250-300 CDs and have encountered lots with pinholes. Two
of these did cause problems. One was in the directory and I could
not direct-access any of the tracks - all I could do was start the
disc at the beginning and let it play. An exchange solved the problem.
Another was large, and black-edged. It looked like a burn of some
kind. That one cuased a very audible pop in the music. Again,
an exchange solved the problem.
I have noticed that the polygram labels in particular seem prone
to little holes. I've been told that they use a thinner aluminum
film than most people, but don't know if this is true. I have never
noticed any problems other than the two mentioned above (the second
of which was a L'oiseau-Lyre (Polygram) and the first of which was
a Nonesuch (Warner). And at least 100 of my CDs are on one or another
of the Polygram labels, and most have a few little holes. The labels
that I almost never find holes in are Telarc and CBS, if anyone
cares.
B
|
| 1407.3 | 1-beam lasers have problems with them | TON80::CAMPBELL | It's only a CRIME if you get caught!! | Mon Nov 28 1988 12:01 | 7 |
| I found that Electra also have pinholes, especially the Harry Chapin
CD's I have. I used to have a single beam laser which didn't like
the pinholes and it 'skipped' whenever it hit them.
I then bought a 3-beam laser player and the CDs work fine.
Smc
|
| 1407.4 | Don't worry, be happy.... | BETHE::LICEA_KANE | | Mon Nov 28 1988 12:53 | 19 |
|
If you think "pinholes" are a problem, you've never looked closely
at the grooves in a vinyl record.
Pinholes, that's what ECC is for. Part of the CD spec states
how many, and what size, pinholes a CD is allowed to have.
Basically, a pinhole is small enough to be corrected by ECC
(inaudible, no loss in information) but not large enough for
interpolation to come into play (audible, loss in information).
If you hear anything audible from pinholes, the pinholes don't
meet spec or your player can't correct for correctable errors.
If you get skips over pinholes, the pinholes don't meet spec
or your player can't track a trackable disc.
1-beam or 3-beam lasers shouldn't have a whole lot to do with
it.
-mr. bill
|