From owner-freebsd-current  Mon Feb  5 22:43:59 2001
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To: current@FreeBSD.ORG
Cc: ticso@cicely5.cicely.de, trevor@jpj.net, akiyama@FreeBSD.ORG
Subject: Re: od driver for -CURRENT
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From: "Kenneth D. Merry" <ken@kdm.org>
Date: Mon, 5 Feb 2001 17:00:41 -0700
> I think we already have the most important functionality from the od(4)
> driver in the da and cd drivers.  If there are any features that are
> in the od(4) driver that should be in the da(4) or cd(4) drivers, but
> aren't, please speak up.

Though I have not tried `da' lately, if you don't insert a medium in
the drive at the time of CAM rescan bus, `da' tries to get the
geometry by XPT_CALC_GEOMETRY then panics with divided by zero in most
SCSI drivers. With `od' it says just the medium is 0MB and does not
cause panic. Probably `od' knows the medium is not in the drive
(watching UNIT READY or something?).  

Is it safe to change the size (geometry) of media with `da', eg. at
first no medium (0MB), then 128MB, 230MB, 640MB (sector size is
2048bytes) and so on ? 

// Noriaki Mitsunaga //


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