Which side is the engraving on???

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dom -  
 blux -
I would like to know and be sure which side a CD is engraved on. For me, it's the underside because after it's been burned, I seem to see grooves. But I have a friend who sells PCs and after a discussion, he tells me that it's the top side of the CD that is engraved, and I have a hard time believing him. Thank you for your help. If there's a website that explains this, please send me the address.
Dom
I don't want to die stupid.

25 réponses

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sebsauvage
 
Yes, I also confirm: the engraved side is the one that has no inscription.
(the one underneath when you place the CD in the burner/player).

Besides, if you look at any CD player/burner: the lens is underneath.
20
claude
 
I won't go buy a PC at your friend's place, either he is messing with you or he is really stingy!
The engraving is done well on the bottom side, the top side is often printed and you can even stick a label (if it is perfectly centered).
The engraving is visible on CD-Rs, much less so on CD-RWs.
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dom
 
Not very satisfied with your answers, I am still in doubt. Who will give me a good response? Thank you.
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mr_poussy Posted messages 2740 Status Modérateur 61
 
On a a CD there are 2 sides:

- In most cases when you open your blank CD case, the side that is presented to you has different things written on it (brand of the CD, characteristics, etc.). On this side, you can stick labels and/or use a marker to write whatever you want (like the content of the CD, for example).

- The other side is therefore protected from contact; it is of a uniform and homogeneous color. This is the recordable side.

It's like on original CDs: there is the side with the album's advertisement and the side where the music is recorded.

Is that clear??
--
Mr. Poussy
1
firstly
 
I agree with you, now can you explain to me when you put a sleeve on a DVD for example, you put your DVD in your home player and after a while it freezes (even though the playback occurs from underneath and the sleeve is on top).
And when there is no sleeve it works wonderfully, and this is the case with 3/4 of the players. The same goes for CDs.
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benhotmail Posted messages 185 Registration date   Status Membre 2
 
Hi Dom,
you’re asking which side the CDs are engraved on?
Well, you’ve seen that there are two sides, and one has changed color after burning.
In fact, the top is the engraved surface, while the bottom serves as a scratch protection.
Be very careful not to scratch the top because that’s where the data is recorded, whether it's mp3s, wavs, or programs.

There you go, have a nice day

:o)

Former Tiben
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Serge Posted messages 24622 Registration date   Status Modérateur Last intervention   210
 
the engraved side is the one where there is nothing written
so the one on the top .........or the one on the bottom depending on how you hold the disc!
i hope that this way you won’t die (for a very very long time!) silly
serge
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brupala Posted messages 111981 Registration date   Status Membre Last intervention   14 423
 
Attention,
We also see double-sided DVDs.
On some CDs (without markings), it is difficult to determine which side is recorded.
In any case, on all the players I've seen so far, the laser lens is indeed on the bottom (see the window in the tray).
Try placing the side with the markings facing down, it will end badly!
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elmine Posted messages 270 Status Membre 24
 
Hi Dom,

I confirm what Sebsauvage and mr_poussy said, who are two people with great knowledge.

In fact, it’s the bottom part that is engraved. The top part, where the ads or prints are, actually serves to stop the laser during engraving. If you want to do a test, scratch the top of your blank CD hard; when the laser hits the scratch, it will go through the CD and your engraving will be ruined.
Another way to check is that the bottom side slightly changes color after engraving; it becomes a bit darker.

I hope your doubts have been cleared up.

Elmine
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mr_poussy Posted messages 2740 Status Modérateur 61
 
it's nice! :)

but I'm far from having great knowledge in computing. I'm just a tinkerer who's certainly no longer a novice but not yet an expert :)

anyway, this kind of compliment is still really pleasant, right seb.. ;)

--
mr pussy
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mat
 
Hi,

isn't "great knowledge" ironic?

see you later
Mat
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mr_poussy Posted messages 2740 Status Modérateur 61
 
arg !!!

it wasn't a compliment then. arf arf arf !!

I really got tricked ;)
--
mr pussy
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Serge Posted messages 24622 Registration date   Status Modérateur Last intervention   210 > mr_poussy Posted messages 2740 Status Modérateur
 
Hello kitty
but if it's a compliment
let's put on a second layer
you're a good kitty!
serge
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mr_poussy Posted messages 2740 Status Modérateur 61 > Serge Posted messages 24622 Registration date   Status Modérateur Last intervention  
 
yesss
cool

but come on, don’t go too hard on the layers because then we end up getting all sticky :))


--
mr poussy
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Anonymous user > mr_poussy Posted messages 2740 Status Modérateur
 
Poussy, you’re totally the atomic ball that kills its mother!

(((-:

kinder.surprise,
the big boss of the kitty
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brupala Posted messages 111981 Registration date   Status Membre Last intervention   14 423
 
Last explanation:
If you look closely at a CD (and use your finger if necessary), you'll notice there's a circle towards the center at the end of the engraved area (or rather at the beginning since I believe we start the disc from the center).
This circle marks the end of the central area where the CD rests in the player. It's a bump on the side of the engraved surface and (often) a hollow on the side of the unused surface... this can help with orientation.
At least, that's what I've noticed.
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elmine Posted messages 270 Status Membre 24
 
No, it’s not ironic, Mat. We are all strong to varying degrees, but what makes us even stronger is that we share our knowledge.

Elmine
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mat
 
Hi,

I understood and agree with what you said! Your compliments were well-deserved.

See you later
Mat
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Laurent
 
Hello,

And the question for €1.52:

What is the most fragile side of a CD, the one you absolutely must not, under any circumstances, scratch?

I’ll let you answer.

@+

Laurent
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Laurent
 
Here’s the scoop:

The most fragile side of a CD is the printed side, which supports the reflective layer; if this layer is damaged due to scratches: bye bye CD. For the other side of the CD, there are error corrections in case of scratches (well... not too many, though).

The lesson is, the danger doesn’t always come from the side we think.

Cya
Laurent
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Johan Daine
 
Anyway, everyone knows that the information is engraved on the lateral edge of the CD.

Johan
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xinu
 
Explanation

During the preparation of the engraving, the engraver splits the CD into 2 identical parts and then engraves the data on the back side of the first disc (are you following along?). Finally, when the engraving is finished, the engraver takes out his little tube of glue and carefully re-glues the CD. THAT'S THE SECRET
never seen, never known ;-)
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Anonymous user
 
I really enjoyed reading all these messages for a silly question like the one that sparked the debate. I'm at work and I laughed reading the answers, as foolish as they may be, just like the question. But good explanations have been offered on the subject, which seem logical especially when you are a computer scientist ;)

I’d like to give a shout out to people like elmine, mr_pussy, sebsauvage, benhotmail... whom I often see in the replies.... :) I'll try to check in from time to time on the various forums to share my knowledge with the community. After all, it's only been a year and a half since I was absent from these forums ;)

Kris©2002
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PhP Posted messages 1774 Status Membre 606
 
Hello everyone,

On CDs, the layer containing the laser-etched information is indeed located on the side of the printed surface but underneath it, in direct contact with the polycarbonate substrate. Since polycarbonate is transparent, it is this layer that we see when we turn a CD over.

Moral of the story: watch out for the printed side! ;-)

For more information:
http://www.mitsuimedia.fr/distri/fr/web/descrip.jsp

See you later
Philippe
[[ The Truth is Out There ]]
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skaraoke
 
realize for yourself, scratch 2 CDs (one on each side) and see which one works best
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GYK Posted messages 142 Registration date   Status Membre Last intervention   3
 
Hi,
I confirm what PHP says, the engraved side is on the label side.
In fact, it's the inside of the label that is the substrate for the engraving. The rest is just a developed protective plastic.
Try the experiment, if you have an old CD, remove the original label and put another one in its place. You will be convinced!
See you!
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