What to do with a useless CD? (0 bytes)

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Bonjour à tous, en effet j'ai beaucoup de CD et DVD et je ne sais plus s'ils ont été utilisés ou pas, c'est-à-dire s'ils sont vierges ou pas. Est-ce qu'il y a une possibilité de reconnaître à l'œil nu s'ils le sont ou pas ?

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Good evening,
You can tie them together with a string and use them as a scarecrow to scare away the birds.
Unless I'm mistaken, they're unusable unless it's like multi-session discs where the CD is not finalized.
Attention to the experts...

I've been having the same problem for a while; my DVD burner is one that came with the tower, a Pioneer Dvd/R-Rw Model Dvr 1060DB Made in China in June 2003. I think I've tried everything, even removing the antivirus; it struggles to recognize what I put in it—CDs of photos, letters, blank ones, etc. When it does recognize it, after 4-5 minutes instead of 10 seconds, it doesn't open consistently.
For burning on CDR 80min, 700MB, it's a disaster; before the operation would take 20 seconds, now it's 2 minutes, and when it says "5 seconds remaining," it actually takes 1 minute, and the CD is ruined, unusable. I'm starting to think I might have to plant trees in the garden for all of them. Yesterday, I managed to burn; there were 5 photos of 20 KB, and it ate up the whole disk... Do you have any solutions, as the so-called computer pros I meet all have different versions?? A+ Jacto

Personally, I break CD's like that in half and throw them in the trash, but it's true that recycling them into scarecrows is better, more eco-friendly :-D ...

As for your case, Jakto, I recommend trying other burning programs because I don't think your equipment is to blame... In fact, when you don't want to use the entire disk space, you need to do it in multi-session if I'm not mistaken (I'm not a pro at burning in practice, but I've watched a lot of topics about it over the last few months). If you want to use only part of the disk space, you have to create a session; otherwise, the entire space will be consumed, and multi-session is not necessarily automatic...
A common piece of advice: avoid running other programs during burning, as a drop in data flow to the burner can cause the burning process to fail and render the CD unusable, at least if it's a CD-R; I don't know about the RW; reducing the burning speed usually reduces this risk...

Right now, I'm having a big problem of this kind: I can't burn any CDs, or depending on the config changes I make, the burning seems to go normally but my CD becomes systematically unusable as described above, and I can tell you I've had tons of unusable CDs like that...

But that's my problem. To answer the question of the topic, I think this kind of CD is perfectly and permanently unusable:
BUT BE CAREFUL: depending on certain Windows parameters, CDs can sometimes systematically appear like this, so make sure to check the CD and its details before throwing away a CD showing these symptoms, especially if it hasn't been burned just recently...
I'm talking about CD-Rs... For CD and DVD RWs, I have no idea at all...