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SubjectRe: disk head scheduling


On Sat, 20 Mar 1999, Gerard Roudier wrote:

> On 20 Mar 1999, Linus Torvalds wrote:
>
[ ...]
> > Density is important to modern disks, and as long as disks rotate you
> > will have a property where the outer tracks have more space.
>
> Yes, that's the method used to increase capacity. But this increases also
> complexity and probably may affect performances due to more complexity in
> the firmware. Btw, the Chetaah2 reports a fixed geometry of 6962 tracks of
> 214 sectors each, and this perhaps explains the reasons it performs so
> well.

Just measured linear speed of the beast.

Start of the medium 18.5 MB/s
End of the medium 12.1 MB/s

So, the Cheatah2 has a variable number of tracks per cylinder as all
modern disks but report the opposite (Btw, I was using scsi-config to
display the disk zones).

Regards,
Gérard.


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