From owner-freebsd-hackers Thu Jun 15 14:06:24 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id OAA03425 for hackers-outgoing; Thu, 15 Jun 1995 14:06:24 -0700 Received: from sass165.sandia.gov (sass165.sandia.gov [132.175.109.1]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id OAA03418 for ; Thu, 15 Jun 1995 14:06:23 -0700 Received: from sargon.mdl.sandia.gov (sargon.mdl.sandia.gov [134.253.20.128]) by sass165.sandia.gov (8.6.11/8.6.12) with ESMTP id PAA13318 for ; Thu, 15 Jun 1995 15:13:00 -0600 Received: (aflundi@localhost) by sargon.mdl.sandia.gov (8.6.10) id PAA14940 for freebsd-hackers@freebsd.org; Thu, 15 Jun 1995 15:06:22 -0600 Message-Id: <199506152106.PAA14940@sargon.mdl.sandia.gov> From: aflundi@sandia.gov (Alan F Lundin) Date: Thu, 15 Jun 1995 15:06:21 -0600 In-Reply-To: "Rodney W. Grimes" "Re: HD Geometry dirty trick" (Jun 15, 11:26am) X-Mailer: Mail User's Shell (7.2.4 2/2/92) To: freebsd-hackers@freebsd.org Subject: Re: HD Geometry dirty trick Sender: hackers-owner@freebsd.org Precedence: bulk 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