Tech4all group blog

Re: [tech4all] Tech: What does 1x in CD-ROM,DVD Means?

The "early" definition (from the old-timer) was 1x
equated to "real time" with only minimal buffering
involved. In other words, if you had a cd that you
wanted to put 40 minutes of audio on, it would take 40
minutes to write it (1x). A 4x drive could write it
in 10 minutes.

Of course the data rate would be different for
real-time audio or real-time video. The bytes of data
required per second for audio and video is quite
different. "real-time" HD Video will require another
data xfer speed...any guesses as to how fast that
baseline is?

--- "Surendiran.B" <surendiran@yahoo.com> wrote:

> Hi,
> We all are speaking about CR-Drive read/write speads
> like 40x,52x etc...
>
>
> Whether any one thought of what does the '1x' means?
>
> Here it is, While a 1x CD-ROM drive has a maximum
> data
> rate of only 150 KBps, a 1x DVD-ROM drive can
> transfer
> data at 1,250 KBps, which is just over the speed of
> an
> 8x CD-ROM drive.
>
> so, 52x CD-Drive read speed = 150 * 52 = 7800 KBps
> [Kilo Bytes per second].
>
> But , a 52x CD-Drive can't really read at the
> specified 52x speed! why? Answer in next mail....
>
> and, Do u know why 1x speed of CD and DVD is
> different? ...answer in next mail....
>
> -Regards,
> Surendiran.B
>
> B.Surendiran,
> If u have time Visit
> Website:
> http://suri.tk/
> http://www.suri.0catch.com/
>
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posted by Bharath @ 10:39 AM