On Thu, 27 Jun 2002, plug bert wrote:

> Hello!
>
> > Few years ago yes. But now, With Ultra ATA 100
> > around,
> > IDE drives can compete with low/medium sscsi drives.
> >
>
>     Hmmm...not so sure about this, pero i read
> somewhere that you really don't get any benefits from
> an ATA100 or an ATA133 drive, coz the physical
> mechanisms of hard drives just can't take advantage of
> the higher transfer rates; i.e. the transfer rate is
> essentially pegged at the physical speed of the drive
> heads, etc. True or false?


I've had a long discussion with Rick Moen about this.  SCSI only has
distinct advantages if you daisy chain several devices in the same bus.
This is because in a SCSI bus, several devices can be active and share the
bus at the same time.  This is not possible with IDE.

But with IDE RAID, only one drive is attached per IDE bus, so
the limitation of IDE is not a factor here.

Bottom line?  For systems which use 1 drive per bus, and have dedicated
I/O controllers (such as raid controllers), SCSI drives have no advantage
over IDE.


_
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