Comments for What does the 'X' in a 48X speed CD-ROM mean?

Comment from Bob on 2010-08-12

2010-08-12T08:32:37Z

Does the X speed improve quality?

Nope. It's all about saving time. If anything, slower can often be better quality and you'll often see readers and burners slow down if they're having problems.

14-Aug-2010

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Comment from PD Brannan on 2009-05-11

2009-05-11T21:43:03Z

I just recently added a cd/dvd reader-writer to my tower, and have been asking MANY questions about the "X" factor.
Your explanation is the only one I have understood, lol! Thank-you!

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Comment from Monina Lao on 2008-12-06

2008-12-06T14:49:45Z

oh thanks finally able to understand the what the speed X really means

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Comment from Tan Jian Wei on 2008-07-09

2008-07-09T13:24:15Z

There are some cases that the cd in the cd drive explodes in the cd-rom drive ---youtube link---
http://www.youtube.com/watch?v=v0QT4Y1Y3ug

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Comment from Kathy on 2008-04-17

2008-04-18T00:50:22Z

Does your comment about increased speed pertain to data as well as audio. Would fast CDs with higher speed function well with data instead of audio, or do the same problems apply? Thanks.
Kathy

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Comment from subnullgom on 2008-01-20

2008-01-20T15:52:44Z

12x8x32 > 12 = max writespeed on a normal recordable cd, 8 = max writespeed on a rewritable cd and 32 is the max readingspeed of a cd.

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Comment from David on 2007-08-10

2007-08-10T14:00:38Z

On a 12x8x32x DVD-RW drive, what does the 8x stand for?

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Comment from AMIT UPADHYAY on 2006-05-31

2006-05-31T10:34:03Z

thanks...i was searching for this 'X' for about half an hour untill i came across this article of yours.
good article.

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Comment from thunderdome on 2006-01-13

2006-01-14T06:38:34Z

hi,
Some people think that the performance of a drive scales linearly with the "X" number of the drive. So they think that a 12X drive will transfer data at 12 times the speed of a 1X drive, will have 1/12th the access time, etc. Even more, they think that if it takes 15 minutes to install Windows 95 on a 4X drive, that it will take only 5 minutes on a 12 X drive. Of course, it is really never this simple. X=150 kilobytes (KB) per second.So a 12X drive will have a theoretical transfer rate of 12*150KB/s = 1.8MB/s. This is only theoretical however, and is affected by command overhead, the interface speed, etc.For more goto "http://www.pcguide.com/ref/cd/perfRated-c.html".

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Comment from Renjith on 2006-01-06

2006-01-06T15:08:09Z

Hello Sir,

Really a good article. I searched for the same in different sites, but not a bit from any other. At last I got this site, and I got what I want from here. Thank you

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Comment from shashi on 2006-01-04

2006-01-04T20:18:17Z

Thanx for providing the detailed info, till date I was nt aware about the basic things about x in 48x.

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Comment from Anne on 2006-01-02

2006-01-03T01:22:13Z

May I use this article for reference in my physics experiment? Oh and where else do you publish your work?

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Comment from Leo on 2005-09-11

2005-09-12T04:11:56Z

Typo - should be RPM.

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Comment from tech-helper on 2005-09-09

2005-09-10T02:51:25Z

hello,

in the info. provided above ...its given that

"A 1X CD-ROM spins 500 times per second"

and the next line 48x means 24000 rotations per MINUTE.
but 48 x 500(rps) = 24000 (rps)
and its given 24000 rpm (units are different)

can u plz tell is it rps or rpm?

bye,
tech-helper

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Comment from zia ur rehman on 2005-06-02

2005-06-02T11:48:12Z

plz tell me the maximum rps speed of a 52x cd rom? and can cd rom attain rps speed more than 1000

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Comment from Leo on 2005-02-03

2005-02-04T02:11:34Z

I believe it varies, but I would assume what you've assumed as well.

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Comment from Mike on 2005-02-03

2005-02-03T15:49:00Z

I can never remember the what the order of the
notation on the oudside of a cd or dvd drive.
For example I have a dvd/cdrw and on the front
it says "52x 24x 52x 16x" I am guessing that
that means it can read a cd at 52x and a dvd
at 24x then it can write a cd at 52x and write
a dvd at 16x. Is that correct?

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Comment from punit pandia on 2004-11-04

2004-11-04T10:54:36Z

this information is certainly helpful but i would like to know
how cd are made and of what material
how things are recorded on them
and please tell me how cd drive reads those cd

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Comment from ReKleSS on 2004-10-20

2004-10-20T08:19:58Z

1x for DVD is approximately 1400kb/s, I think... this is according to readcd.
-ReK

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Comment from winston on 2004-10-09

2004-10-09T08:22:50Z

i thought 150kb/s for cd-rom was only an estimation, what is the exact speed??

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Comment from Leo on 2004-07-10

2004-07-11T00:32:18Z

The problem is that it varies. I've read between 1400 and 580 RPM depending on whenre on the disk you are. 2x and 4x may not be strict multiples either, since manufacturers will play games with things like "effective" and "burst" data rates. Try this site: http://www.osta.org/technology/dvdqa/dvdqa4.htm

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Comment from Dude on 2004-07-10

2004-07-11T00:23:21Z

1x CD is 150kb/sec
so 52x is 7.8Mb/sec and 48x is 7.2Mb/sec

Can someone PLEASE post what 1x DVD speed is?

Thanks

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Comment from Paul on 2004-05-27

2004-05-28T05:54:36Z

this info helps
but id like to know how many KB/sec each multiple is for dvd if i remember correctly 1x cd-rom is 1500 Kb/sec and im pretty sure each dvd multiple is faster
thanks

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