Date: Fri, 16 Jun 1995 15:15:34 -0600 From: aflundi@sandia.gov (Alan F Lundin) To: freebsd-hackers@freebsd.org Subject: Re: HD Geometry dirty trick Message-ID: <199506162115.PAA17715@sargon.mdl.sandia.gov> In-Reply-To: terry@cs.weber.edu (Terry Lambert) "Re: HD Geometry dirty trick" (Jun 16, 3:01pm)
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On Jun 16, 3:01pm, Terry Lambert wrote: > Subject: Re: HD Geometry dirty trick > > > Does this mean that it's possible that every distinct > > BIOS could produce a different geometry for a given disk > > drive, so that there is no way to predict via an algorithm > > for all machines what the BIOS geometry should be? Bummer! > > Yes. Generally, it's on a per controller ROM revision basis, and > is not specific to internal machine BIOS. It gets the general name > of "BIOS" because the POST routines on the card point the INT 13 > interface to their own ROMs, replacing/chaining the default BIOS. > > And there's no way to ask... there's a way to figure it out that mostly > works, but which can run into LCF problems. If there's no way to ask, how does DOS do it? Or does DOS just ask the BIOS to do it? --alan
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