From: Manish Lachwani <m_lachwani@yahoo.com>
To: Valdis.Kletnieks@vt.edu
Cc: linux-kernel@vger.kernel.org, Michael.Knigge@set-software.de
Subject: Re: FW: Fastest possible UDMA - how?
Date: Fri, 10 Jan 2003 11:27:27 -0800 (PST) [thread overview]
Message-ID: <20030110192727.63417.qmail@web20502.mail.yahoo.com> (raw)
In-Reply-To: <200301101921.h0AJLFLK012541@turing-police.cc.vt.edu>
If the drives support UDMA 2, then the controller will
operate in UDMA 2. In that case, the IDENTIFY
information will show UDMA 2 for UDMA mode selected
and UDMA 2 for UDMA mode supported.
Now, say that I have a drive that supports UDMA 6 and
the controller supports UDMA 5. Then, from the
IDENTIFY information, the UDMA selected would be UDMA
5 while the UDMA supported would be UDMA 6.
Thanks
manish
--- Valdis.Kletnieks@vt.edu wrote:
> On Fri, 10 Jan 2003 11:04:03 PST, Manish Lachwani
> <m_lachwani@yahoo.com> said:
> > Take a look at the drive IDENTIFY data. From the
> ATA
> > spec, it can be seen that word# 88 in the IDENTIFY
> > data can help you find out the UDMA mode selected
> and
> > UDMA mode supported.
> >
> > The UDMA mode supported is the maximum supported
> by
> > the drive.
>
> Will this DTRT if the IDE *controller* does UDMA-5
> but the drives are UDMA-2
> at best?
>
> ATTACHMENT part 2 application/pgp-signature
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next prev parent reply other threads:[~2003-01-10 19:18 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <233C89823A37714D95B1A891DE3BCE5202AB1B88@xch-a.win.zambeel.com>
2003-01-10 19:04 ` Manish Lachwani
2003-01-10 19:20 ` Valdis.Kletnieks
2003-01-10 19:27 ` Manish Lachwani [this message]
2003-01-10 20:09 ` Valdis.Kletnieks
2003-01-10 20:15 ` Alan Cox
2003-01-10 19:31 ` Michael Knigge
2003-01-10 20:48 ` Andre Hedrick
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