From: sehh of H.I.C. & D.B.S. (sehh_at_altered.com)
Date: Sat Apr 01 2000 - 12:30:15 EST
On 29 Mar 00 10:47:17 CST, Rob Bell wrote:
>Have any of you checked the actual speed of your ThinkPad CD-ROM drive (or
>DVD)? I just ran a check with a tool called CD-ROM Drive Analyzer v2.1.1,
>available from ZDNet. It reported that the 24x CD drive on my 770 was running
>at exactly 12x transfer rate (on a standard software installation CD, not a
>CD-R or audio CD). This surprised me.
Remember that the speeds marked on cdroms are just the MAX speed using a
specific cd. What i mean is that a CD filled with 600megs will give you a different
speed rate than a 50meg CD. The speed varies on the 'place' that the laser is reading,
so higher speeds will be reached if the laser reads closer to the 'edge' of the CD and
slower to the 'hole'.
Another thing is the slin-up delay, which many programs may interpret it as a delay
of the CD to read. Its because very fast cdroms need a bit more time to reach max
speed. So in the end a 20x speed cdrom may be faster than a 50x when it comes
to read in bursts and the cdrom has alread spinned-down.
You should tolerate cdroms at about half the reported speed. Although most
of them don't even reach that much. Typical marketing stuff.
There are other details on this but i'll stop here since i'm out of topic :)
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