[lug] my "no-data-movement" file-copy attempt
stellarhopper at gmail.com
Tue Oct 18 22:00:34 MDT 2011
On that, I remember having read about 'short stroking' which is essentially
restricting data to the outer sectora because they have more linear velocity
(angular velocity being constant).
There's a discussion here:
But I don't know if this no longer holds for modern drives :)
On Tue, Oct 18, 2011 at 21:35, Doug Pintar <ratnip3 at gmail.com> wrote:
> ----- Original Message -----
> From: "Lee Woodworth" <blug-mail at duboulder.com>
> To: "Boulder (Colorado) Linux Users Group -- General Mailing List"
> <lug at lug.boulder.co.us>
> Sent: Tuesday, October 18, 2011 9:31 PM
> Subject: Re: [lug] my "no-data-movement" file-copy attempt
> > On 10/18/2011 09:34 AM, Zan Lynx wrote:
> >> Beyond that, I am not surprised that a 250 GB drive is half as fast as
> >> the 500 GB drive. One hard drive performance parameter is the density of
> >> data on a track. A drive with double the data density will have double
> >> the transfer rate, if the spin rate and track spacing are the same.
> > That's an interesting idea. Another variable could be the data placement
> > on the drive. If tracks near the spindle have a different transfer rate
> > than tracks at the edge of the platter the placement could make a
> > difference.
> > Anybody know how modern drives are?
> As far as I know, modern drives put more sectors per track as you move
> toward the outer tracks, so the transfer rate remains relatively constant.
> Doug Pintar
> Web Page: http://lug.boulder.co.us
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