On Thu, 29 Jun 2000, you wrote:
> I am wondering what the normal speed for UDMA66? I just got about
> 14M/second, as fast as UDMA33.
What do you mean with "normal-speed"?
What are the normal speeds of a 5-lane and a 3-lane highway? I dunno.. it
depends..
A drive that only supports ATA/33 which runs at 7200 rpm can easily outrun a
drive that supports ATA/66 which runs at 5400 rpm (provided they have the
same amount of cache on the drive's internal controller).
An ATA/66 drive that run on 7200 rpm, with only 256kb cache (WD), can easily be
outrun by a ATA/66 drive (running in ATA/33) mode that runs on 5400 rpm with an
optimized 2048kb cache.. (Maxtor).
Just because newer generation drives often run faster than older drives and
also support ATA/66 or ATA/100, doesn't mean ATA/66 drives are by default
faster than ATA/33, because those two facts are not related.
ATA/66 is only interresting in ATA-RAID configurations and I haven't seen a
drive yet, who can some close to 33MiB/s data-transfer speed
(ATA/33) (burst-speeds not accounted, but they are not interresting for the
overal performance..)
>
>
> >From: Civileme <[EMAIL PROTECTED]>
> >Reply-To: [EMAIL PROTECTED]
> >To: [EMAIL PROTECTED]
> >Subject: Re: [expert] UDMA66 problem
> >Date: Thu, 29 Jun 2000 08:09:30 -0800
> >
> >Philippe Wautelet wrote:
> >
> > > Civileme wrote:
> > >
> > > > 7.0 didn't really support UDMA/66 without a lot of tweaking. My guess
> >is
> > > > that your WD drive cannot do UDMA66 even though it was advertised to
> >do
> > > > such.
> > >
> > > Not impossible, but my drive doesn't work with any DMA mode in 7.1 (and
> > > it worked
> > > in 7.0 and in MSWindows).
> > >
> > > Another question directly related to that problem is what are the
> > > software or
> > > config files which have or could have an influence on the drive
> > > performances?
> > > I'm nearly certain that my problem doesn't come from the kernel. I know
> > > also
> > > that it's not hdparm (I tried the version included in 7.0).
> > >
> > > Philippe
> >
> >Actually the big change, AFAIK, is that UDMA66 is set up to work out of the
> >box.
> >
> >This would suggest that it is specific to the HPT366 Controller/WD setup.
> >
> >Go to http://forum.mandrakesoft.com and look under UDMA66 Solved. I think
> >you
> >might yet be able to make it work, though it might not work at 66. I
> >wasn't
> >joking yesterday. I am really buying ATA/100 equipment to see if it will
> >work
> >at ATA/66.
> >
> >And even if it does work at 66, the missing error-checking feature would
> >make
> >me distrust my own system. WD drives really do blow off the CRC.
> >
> >So what is your board--Is the HPT366 integral or a card?
> >
> >Civileme
> >
> >
>
> ________________________________________________________________________
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Cheers,
--
/* Manu�l Beunder. (aka MBr)
- http://how.to/sblive the SB Live! Linux page -
'You must be the change you wish to see in this world. -Gandi' */
