Re: r/w speed inner vs outer tracks

[Rob Pickering <rob@redbourne.com>]

You don't say what type of media.

Modern high performance hard disks have more sectors/track on the outer 
cylinders, therefore in theory read more data in the fixed time for one 
revolution. Of course unless you structure your logical reads so that you 
read a whole physical track in one go after geometry translation by the 
drive, which is nearly impossible, you still have to wait the same amount 
of time for the data you want to come around whether the sector is on an 
inside or outside track.

Older/slower hard disks had the same number of sectors/track irrespective 
of the position on the media, hence same angular density and transfer rate.

CDROMs vary the rotation speed hence you get slow seeks, approximately 
constant data rate, but different linear bit densities on the media.

--
         Rob.

At 11:18 01/06/01 +0100, you wrote:
>http://apollo.backplane.com/FreeBSD/tuning.html
>says data transfer from outer tracks is more quick than from inner
>ones -- however, two members from our tech stuff say that it is more
>quick from inner track sthan from the outer ones.
>
>So,which is more quick: r/w from inner tracks or from outer tracks ?
>Or is this neglectable in (about 30 to 90 minutes) cpu intensive
>computations [i.e. (re-) sortings of indices and elements' values in
>large matrices] ?