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From: Mark Lord <lkml@rtr.ca>
To: Krzysztof Oledzki <olel@ans.pl>
Cc: Jeff Garzik <jgarzik@pobox.com>,
	linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org
Subject: Re: SATA speed. Should be 150 or 133?
Date: Thu, 23 Jun 2005 23:08:59 -0400	[thread overview]
Message-ID: <42BB794B.6080109@rtr.ca> (raw)
In-Reply-To: <Pine.LNX.4.62.0506240135340.29382@bizon.gios.gov.pl>

True SATA drives ignore the "transfer speed",
as it really is meaningless and does not apply.

But most (all?) first-gen SATA drives are really
PATA drives with a SATA bridge built-in.
Some of those drives require that Linux set the
DMA transfer speed for them to work reliably.

Last I looked, the highest valid PATA transfer
speed was still "UDMA/133".  150 just plain
doesn't exist for PATA (and the whole concept
doesn't exist for SATA, so ..)

Cheers

  reply	other threads:[~2005-06-24  3:09 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-06-23 23:47 SATA speed. Should be 150 or 133? Krzysztof Oledzki
2005-06-24  3:08 ` Mark Lord [this message]
2005-06-24  9:33   ` Krzysztof Oledzki
2005-06-24 15:35     ` Mark Lord
2005-06-24 18:35       ` Krzysztof Oledzki
2005-06-26  1:57         ` Mark Lord
2005-06-26 10:31           ` Krzysztof Oledzki
2005-06-26 13:59             ` Jeff Garzik
2005-06-26 14:14               ` Krzysztof Oledzki
2005-06-26 17:08                 ` Jeff Garzik
2005-06-26 18:44                   ` Stefan Smietanowski
2005-06-27 20:53                 ` Mark Lord
2005-06-27 20:50             ` Mark Lord

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