A cd exploded in our cdrom!

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chromaX
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Post by chromaX »

dracflamloc wrote:I assume this means you have??!
I'm not that crazy ;) My sense for dimensions is enough developed to see it just won't fit without trying. Maybe I could somehow mount the pan onto a Dremel...
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Post by dagcrack »

Friction occurs when theres surface (be it air a surface if you want) contact... Do your see your cds borders beveled with the time?, or the tray losing particles of plastic?... No, theres no such thing as friction going on. Friction in this case would lead to abrasion, and thats bad.

Usualy, the cd gets trapped against the motor axis and the top restrictor... Those lead the cd. Theres usualy on some car audio systems, small pins all around the drive which prevents the cd to get out of control when theres bounces, etc. (no thats not the anti-shock technology trust me). I cant remember seeing those in PC cdroms though, but my memory is dead today :)

Since cds dont shatter every day, the only explaination I find is defective material..!, And I don't think it comes with wear and tear, at least not always... It did happen to me once, and only once.. I bought some CHEAP blank cds.. at those times they were 650MB (and, may I say.. the acrylic was better.. If you dont believe me just go find some old cds and you'll notice a BIG difference when you try to bend them). Now, I burnt the cd.. clicked on "done", nero opened the tray... and I see a broken cd!, but it was not shattered, it just seemed to break when the tray opened or the final lead-in lead-out was done. It was broke in half, I still have it somewhere I guess.

The cdrw drive was ok... it still works on my other pc though!.
So I vote for defective materials.
Now adays CDs not only got cheaper in price but also in quality ;)


--- Edit ---

No.. Couldnt find the damned cd, I guess it ended up in the trash bin. Its been long time since that happend anyway.
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chromaX
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Post by chromaX »

Yeah, why should you keep a broken disc? :lol:

You're right on the material deal. Quite a difference.

I never broke a CD. Well, at least not under normal using conditions. But you could always abuse CDs as Shurikens :lol:
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Post by thefool »

OH SHIT! I just got a hole in my computer :/
my cd drive tried to read without a cd in the drive and now my whole computer MELTED because of the high powered (12 volts i think !!!!) laser beam shot trough..

damn. Dagcrack do you fix such things? I've been fixing computers a lot but this time its too much. I should have listened to Lyon and switched back to floppy's when i read about the overheated lasers :oops:
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Post by dagcrack »

Hahah.. Just open one yourself connect it and put your finger over the laser if you can..

Either the polycarbonate is worst now adays or the injection methods used today are the cause for such floffy cds...

The cd laser is powerful enough just to mark a bump in the aluminium layer.. thats all.

chromaX: Well I couldn't believe it.. I think I went to the place I bought them just to show the cd to the guy, he was like me "so how the hell did you do that?" ... I bet he never complained to the company anyway :(.

Back in those days I had much more time on my hands though!.

Ya know.. I think cds could hold almost double data with out much modification, just the initial spiral should be closer than it is right now.. and well, the cdroms should be able to keep up with this change as well. Problem is that you'll need double-precision for the drive... But, thats not all.. Big problem are DVDs ;) For the companies its better to make dvds.. they will earn more money. Thats what they think right now though. If they just remade cds as I say (which must be pretty doable, if you have a microscope youll understand what I mean, the spiral separation is quite big, I dont know if this is because of laser issues, but Im pretty sure its for drive precision limits, either that or a contract with dvds that holds them back).


The other problem would be that... if theres a change in the hardware, no one would care to buy another drive (which is capable to read this new cds and the old ones) because they already (pretty much everyone) have dvd drives and they do the job more than fine.

Case closed? :P
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chromaX
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Post by chromaX »

Yeah, why should he complain, wasn't his loss after all. :?

Beer seems reasonnable to me ;) *off*
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Post by dagcrack »

Complain just because its a bad quality product and he should either tell them "well, please dont send in bad quality cds, else I will stop buying from you" ... Thats the behavior you expect.. But sometimes it wont happen. They don't give a damn most of the times.. I don't even know why they have a shop or even bother to wake up every morning :lol:
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Post by thefool »

they usually don't know anything about what they say :P
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Post by dracflamloc »

dag: CDs can jitter when they spin, and many cd drives have some padding and such in various places to stabilize it. This can cause friction.
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Post by chromaX »

Dagcrack: Honestly, if someone walked into your shop showing you a broken CD, and due to the fact the CD in Tray Breaky Thingy doesn't happen everyday, so it mightn't be known to Mr. Service Dude (you), would you believe this guy?

Customer Dude: "Dude! My CD Drive just broke this disc NEATLY in TWO pieces!"
Service Dude: "O RLY?"

But you're right on the point customer service isn't always good. On the other hand, quoting a character of a Webcomic I like: "Customer Service is like chewing on broken glass. Only 100 times less fun."

Just imagine there's some random guy coming into your shop, bragging about his knowledge, and then pointing at a Computer and asking you: "So... How many jigga-watts does this unit have?"

Or, or, or... Countless examples on stupid customers (not implying you're one of them!) ;)
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Post by dagcrack »

dracflamloc wrote:dag: CDs can jitter when they spin, and many cd drives have some padding and such in various places to stabilize it. This can cause friction.
Show them to me please.

They shatter because of defective materials I'm 90% Sure about this. Don't guide yourself by tv shows or what you read on any website... Because as you, they might be writing from a fake source.

In the case of mythbusters.. their tests (even though I have a great time watching them) are really sad... Think about how many CDs breaks in total, the percentage of total sold cds... of which got broken might be 1% or less. It might be common if you do a search on "broken cd" but then, why dont you do a search on "cd" and try to find how many links refer to a broken cd??...

If you're going to test this, you must put at least 10 cdroms and 1000s of cds into test... Not 1 cdrom and 20 cds like they did.



Any plastic that has a bubble of air can break in any time if the correct amount of force is applied to it. I'm not saying this is the case, but could be.. You can see the cds are ok but internally, how can you tell with your bare eyes.

CDs many many years ago didnt ever shatter ;)

As with anything, when it gets mass produced and materials get cheaper (in quality) bad things can happen. Many things last shorter than before, they break more easily, etc. regardless of how much care you give to it.

And I showed the cd to the guy the next time I went to buy, just so he wouldnt order any more cds from that brand. it did not damage any hardware as I said.

Most guys on a shop know nothing about what they are supossed to know a lot... They are supossed to know because at the end if the customer doesnt know, he should guide him the right path. IN AN IDEAL WORLD THAT IS.

I dont know over there but here people reasembles a big ass with 2 legs and a hand to slap your back after they stole you with their other hand.


The oscilation could just be the right force to break the defective CD.

The more a cd has is the polycarbonate. Acylic it has just a little say 5 times less than the latter. Wouldnt the hole thing break if the polycarbonate shatters?.

In my case it just broke CLEAN in half.. but really clean into 2 equal pieces, which is something I personally never seen in my life.

Shattering and this, might differ.

But at the end, the shattering might be the product of your half-broken cd spinning wild inside the casing of your cdrom ;).
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dracflamloc
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Post by dracflamloc »

ummm, read my first post dag. I was talking about the HEAT of cds after you take them out of the drive. I was replying to a post that was made earlier in this thread.

I never said they'd shatter because of it...

Pull your head out of your butt for more than 2 seconds alright?

(btw thanks for the little science lesson :wink: )

Also I've only watched mythbusters maybe once in my life. I dont get cable tv.
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Post by techjunkie »

Some small changes... and...

AC/DC exploded in our CD room!

:lol:
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Post by dracflamloc »

OMG!

/me breaks out the lighter
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Post by RichardL »

SENSELESS DESTRUCTION - But fun
=================

At your own risk...

Open microwave
Place cup, half full with water in centre
Place unwanted CD on top of cup
Close door
Select full power and 10 seconds
Start
Observe

As I said AT YOUR OWN RISK....
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