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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: AHCI/ATA_CAM for dummies?
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Doug Barton wrote:
> I'd like to test the new stuff, but my main concern at this point is
> that I am not 100% sure how to change my fstab, what will happen if I
> need to revert, etc. I'm sure I probably _could_ figure it out, but it
> would save me a lot of time if someone could write down really
> explicit step-by-step instructions ... put this in your kernel config,
> do this to fstab, do this if it blows up, etc.
> 
> Any takers?  :)

Maybe

http://ivoras.sharanet.org/blog/tree/2009-11-17.trying-ahci-in-8.0.html

?