From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Lord <liml@rtr.ca>
Subject: Re: what is hdparm doing?
Date: Tue, 28 Feb 2006 23:18:29 -0500
Message-ID: <44052095.8070607@rtr.ca>
References: <E1FED6T-0004a4-LN@highlab.com> <4404F89C.8040008@rtr.ca> <E1FEHuv-0004mb-VL@highlab.com>
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To: Sebastian Kuzminsky <seb@highlab.com>
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Sebastian Kuzminsky wrote:
 >
> So how do I know what PIO mode the drive wants to use?
> 
> And how do I tell the HBA what PIO mode to use?
> 

You don't do either of those.
The device driver takes care of it, if needed.

In this case, they were both likely set up for PIO4.

Cheers