Date: Thu, 15 Jun 1995 15:06:21 -0600 From: aflundi@sandia.gov (Alan F Lundin) To: freebsd-hackers@freebsd.org Subject: Re: HD Geometry dirty trick Message-ID: <199506152106.PAA14940@sargon.mdl.sandia.gov> In-Reply-To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> "Re: HD Geometry dirty trick" (Jun 15, 11:26am)
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On Jun 15, 11:26am, "Rodney W. Grimes" wrote: > Subject: Re: HD Geometry dirty trick > > > > > Hi there folx, > > > > > > I've found that using "basic" geometry of 1023/64/32 > > for SCSI HD with 1Gb capacity and just adjusting the first > > value for other capacities , one can get painless install . > > Foe example , if you install 4Gb HDD - we multiply 1023 by 4 > > and use 4092/64/32 Geometry. > > For 300Mb SCSI disk we use (Int(1023/3.3))/64/32 and so on. > > Fine for Adaptec controllers, not so fine for NCR controllers that > like to tranlate >1G drives to xxxx/62/34, yes that is right 62/34! Non-the-less, this seems like a really useful thing to know. I just installed 2.0.5R on an Adaptec and a Buslogic controller and each did the xxxx/64/32 trick. If we could collect these geometries for as many controllers as possible, it could save a lot of headaches for others (it really hurt to boot DOS!). --alan
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