| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1299.1 | ! | WOTVAX::STONEG | Temperature Drop in Downtime Winterland.... | Mon May 22 1995 20:27 | 8 |
|
Not too sure about the life-span thing, however I do know that the top
(ie. non-playing side) of the Cd is the most important when it comes to
scratches. the plastic surface is thinner on top (like me & Mike !) so
it's easier for scrathes to penetrate to the metail film inside - if
one does, then the Cd's knackered.
G.
|
| 1299.2 | | CHEFS::GEORGEM | Cannibalise Legalbis | Mon May 22 1995 20:30 | 4 |
| ah. One of my CDs that is almost completely wrecked on the top-side, is only 2
years old. It's disgraceful. I look after them pretty well, but guess that
the abrasive edges of my autochanger cartridge are having a negative effect on
the discs...
|
| 1299.3 | | CBHVAX::CBH | Lager Lout | Mon May 22 1995 20:48 | 7 |
| Don't forget the scare story a year ago or so where certain manufacturers
(PDO in this case I think) used a type of packaging which created emissions
which would eat away at the layer of laquer over the aluminium plate, causing
it do oxidise (ie not be playable). I would imagine that scratches in the
laquer covering would have a similar effect...
Chris.
|
| 1299.4 | | MOVIES::VERBIST | | Mon May 22 1995 20:48 | 20 |
|
There was a big noise about this last year. Some CDs produced by a particular
plant over a period of about a year had a tendency to go yellow in colour
as the consituents of the plastic broke down (somebody dropped a bottle
of Bud in the mixer probably). As they get more yellow, less laser light
gets through (or something like that) and you start getting errors, tracking
problems etc.
At least I think that was it.
I haven't heard anything about a 25 year lifespan though. I think more
recent CDs will last longer than old ones. I have heard about a 5 year
lifespan for the lasers in a CD player, but the one on my desk has been around
for maybe 8 years - probably before they'd got the inbuilt obsolescence tuned
right.
Guy
p.s. well technical eh? You'd never guess I don't have a clue what I'm talking
about
|
| 1299.5 | | MOVIES::VERBIST | | Mon May 22 1995 20:54 | 4 |
| re .3, .4, uh-oh, notes clash. I think Chris has the technical details
off better than me. It's the yellowing you've got to watch out for.
Guy
|
| 1299.6 | | RIOT01::KING | Mad mushrooms | Tue May 23 1995 15:11 | 22 |
|
Presumably all the heat generated and kept in close proximity to a CD
in the car autochanger wouldn't help things. I was a bit worried about
my CDs when I first borrowed a car with a head-unit type single CD (where
the tape slot should be). After playing one album for it's length
(60-odd minutes) at reasonable volume the CD came out at the same
temperature as your average Tunisian car bonnet. I wonder how it
really affects the CD's though...?
re: CD lasers
My Sony finally pegged out after 8.5 years last year; I think it's the
laser as over a period of months it appeared to get progressively worse
as if the CD were permanently jumping around, until it wouldn't play
certain CDs. Some played almsost OK though...but the charge that the Sony
shop wanted to bung my way just for checking out the thing - to tell me
whether or not the laser was knackered (another 100-odd quid to
replace?) or whether I'd just been stung for an expensive lens clean
was a bit too much to bear... I went out and bought another CD instead
that will hopefully last another eight years.
Chris.
|