noisy cd

[rtrottie]

i just got a new 50x cd-rom,and works really
fast,but it makes a lot of noise when i am
installing software,and the little light
on it stays on quite a while.are these bad
signs,the cd-maker is CenDyne.

[DonJ]

Is it mounted horizontally or vertically? I've seen ones mounted vertically that make a load roaring noise but work fine. Now, if you're hearing loud clunking noises, then yes, that is a bad sign of things to come.
Just a couple of ideas...
DonJ

[AlienDyne]

If it reads all the disks, your CD-ROM is ok.
Some CD-ROM units are very noisy, due to their speed.

The best thing you can do is to clinch it firmly on the case using more screws.

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"Matter is passive. In spite of its power, it can't be controlled without the human mind." Sokrates

My Hardware Info, Hardware Media and Computer History page (http://www.geocities.com/alienhardware)

[shawnMt]

I remember when I first took the cover off an old CD player to see it spin the disk. I thought "wow that's fast."

Heh - take the cover off a 40X or up and plug it up. Pop a disk in and watch how fast it spins. I'm suprised a disk hasn't shot out of a drive and took someone's head off http://forums.windrivers.com/cgi-bin/forum/smile.gif

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[AlienDyne]

BTW, does anyone know the exact RPMs a new CD-ROM unit reaches???

I'm really curious! http://forums.windrivers.com/cgi-bin/forum/rolleyes.gif


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"Matter is passive. In spite of its power, it can't be controlled without the human mind." Sokrates

My Hardware Info, Hardware Media and Computer History page (http://www.geocities.com/alienhardware)

[Jeff the Brit]

An audio CD player (single speed, by definition) runs at 250 to 350 rpm depending which part of the disk is being read ... now that gives scary numbers for a x50 drive !

[AlienDyne]

Thanks for the info Jeff!

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"Matter is passive. In spite of its power, it can't be controlled without the human mind." Sokrates

My Hardware Info, Hardware Media and Computer History page (http://www.geocities.com/alienhardware)

[Mustang]

and i wouldnt think of taking the cover off a new cd rom to see how fast it spins
had someone do it with a 12x and shot the disk across the room and stuck it in the wall

[techs]

Originally posted by Jeff the Brit:
An audio CD player (single speed, by definition) runs at 250 to 350 rpm depending which part of the disk is being read ... now that gives scary numbers for a x50 drive !
17,500 rpm. i am scared.

[Rich@cntrycomp]

i think that 50x is a little misleading..

i know of hard disk drives that go pretty fast, but they are pretty well much secured, these cd`s are loose inside the cdrom drive relatively..

and i thought those big foot drives were limited in speed cos of their large diameter.. wouldn`t the same apply to the cd`s?

you know how the edge of the cd would be going waaay too fast to read from?

*shrugs*

would be interested to know the actual speed though.. and where they get 48x, 50x and even 72x cdrom speeds from..

[techs]

Originally posted by Rich@cntrycomp:
i think that 50x is a little misleading..

i know of hard disk drives that go pretty fast, but they are pretty well much secured, these cd`s are loose inside the cdrom drive relatively..

and i thought those big foot drives were limited in speed cos of their large diameter.. wouldn`t the same apply to the cd`s?

you know how the edge of the cd would be going waaay too fast to read from?

*shrugs*

would be interested to know the actual speed though.. and where they get 48x, 50x and even 72x cdrom speeds from..

the 50x number indicates it will read data(optimally)at 50 times the original transfer rate of 1500kbps that audio cd's used. I am not sure if there is a 1 to 1 correlation between rotational speed and transfer rate, but i think there is.



[This message has been edited by techs (edited November 07, 2000).]

[Larommi]

Originally posted by AlienDyne:
If it reads all the disks, your CD-ROM is ok.
Some CD-ROM units are very noisy, due to their speed.

The best thing you can do is to clinch it firmly on the case using more screws.




I have on occasion placed those little paper washers that come with cases in between the drive and mounting brackets. Sometimes it helps but it cant do much if the sound is coming from in the drive.


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You spend your whole life believing that you're on the right track,
only to discover that you're on the wrong train.

[AlienDyne]

That's a good tip Larommi. Thanks!

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"Matter is passive. In spite of its power, it can't be controlled without the human mind." Sokrates

My Hardware Info, Hardware Media and Computer History page (http://www.geocities.com/alienhardware)

[techs]

Originally posted by AlienDyne:
That's a good tip Larommi. Thanks!


Ditto.

[braybk]

The rpm speed of a cd-rom drive depends on a couple of things. Obviously the rated speed of the drive has much to do with it, but there are a couple of other things as well. Now, if I remember my physics right, there are couple of different methods/technologies for rotating a cd at the correct speed. I don't remember which technology audio cd drives use.

A drive using constant angular velocity would rotate the disc at the same rpm constantly, whether or not data is being read from the inside edge of the disc or the outside edge. Since the disc rotates at a constant ANGULAR velocity, the data on the outside edge of the disc can be read faster, since it has more distance to cover in one revolution, and so actually flies over the read assembly faster.

There is also constant linear velocity, which adjusts the rpm of the disc depending on where the data is being read from. That way, you get a more stable transfer rate throughout the entire range of the disc.

Most drives these days use a combination of the two methods.



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