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Date:      Fri, 29 May 1998 06:18:14 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Doug White <dwhite@resnet.uoregon.edu>
Cc:        chat@FreeBSD.ORG
Subject:   Re: Compatibility with Ultra IDE drives?
Message-ID:  <19980529061814.D25469@freebie.lemis.com>
In-Reply-To: <Pine.BSF.3.96.980528110226.2373R-100000@gdi.uoregon.edu>; from Doug White on Thu, May 28, 1998 at 11:04:17AM -0700
References:  <19980528102719.D342@freebie.lemis.com> <Pine.BSF.3.96.980528110226.2373R-100000@gdi.uoregon.edu>

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On Thu, 28 May 1998 at 11:04:17 -0700, Doug White wrote:
> moving to chat ...
>
> On Thu, 28 May 1998, Greg Lehey wrote:
>
>>> My IDE drive in gdi.  You can tell when it's working.  The SCSI drive
>>> could do a full search on itself and I'd never know it.
>>
>> What kind of transfers are you doing?  With DMA, there's very little
>> difference.
>
> Hm, I'll have to demo a UltraDMA computer.  I'm only on standard IDE.  Is
> UltraDMA tothe point where it actually is a win?  Originally the critics
> were saying there was no win with ultradma.

I'm sure the critics still say all sorts of things.  I'm not sure one
way or another.  It's certainly a win against programmed transfer in a
computer which doesn't wait for every transfer.  SCSI is still faster
for a multi-user system, but IDE has a lot going for it nowadays.  You
saw the figures: my make world was significantly faster with IDE than
with SCSI.  On the other hand, the system time was a little longer,
which suggests that the transfers aren't quite as efficient.

Greg
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