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Date: Mon, 8 Dec 2003 00:50:04 -0500
To: JacobRhoden <jrhoden@unimelb.edu.au>,
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From: Garance A Drosihn <drosih@rpi.edu>
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Subject: Re: Why would drive run at UDMA33? (Segate 80GB)
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At 4:21 PM +1100 12/8/03, JacobRhoden wrote:
>Hi,
>
>I have just purchased a new 80GB drive, howerver i noticed it is running
>significantly slower than my current 80gb drive.
>
>Dmesg says this:
>   ad0: 76319MB <ST380021A> [155061/16/63] at ata0-master UDMA100
>   ad2: 76319MB <ST380011A> [155061/16/63] at ata1-master UDMA33
>
>Why is one running at udma100 and my new one running at
>udma33? iosys reports it as 4 times slower! Is there any
>special tuning or kernel option i need to set?

This may not be useful for you, but I hit a problem like
this at one time.  In my case, it turned out that the
ATA cable was hooked up backwards.  By that I mean that
the "motherboard" end was connected to the hard disk, and
the "master disk" end was connected to the motherboard.
It worked, but ran at the slower speed.

-- 
Garance Alistair Drosehn            =   gad@gilead.netel.rpi.edu
Senior Systems Programmer           or  gad@freebsd.org
Rensselaer Polytechnic Institute    or  drosih@rpi.edu