Manuel Bouyer writes:
> On Wed, May 22, 2002 at 06:28:18AM -0700, Wolfgang Rupprecht wrote:
> > Anyone have a good model for what is going on here?
> IDE doesn't do disconnect/reselect, so when you have 2 concurent one
> drive is idle while the other one is working. So in your test it's
> expected to have the per-drive transfer rate drop by half.  I'm not
> sure why it's more than half. Maybe the extra delay between 2
> transfers prevents the drive from doing some kind of "streaming" ?

Thanks!  I didn't know about the lack of disconnect on IDE.  That does
make one wonder if ATA-100 has any utility.  If drives can't share the
bus why bother with a channel that can go 2.5x faster than the data
can come off the disks?

-wolfgang
-- 
Wolfgang Rupprecht    <wolfgang@wsrcc.com>     http://www.wsrcc.com/wolfgang/
Coming soon: GPS mapping tools for Open Systems. http://www.gnomad-mapping.com/