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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!spool.mu.edu!howland.reston.ans.net!europa.eng.gtefsd.com!uunet!destroyer!nntp.cs.ubc.ca!newsserver.sfu.ca!sfu.ca!vanepp From: vanepp@fraser.sfu.ca (Peter Van Epp) Subject: Re: Adaptec 1542b and geometry translation Message-ID: <vanepp.760376417@sfu.ca> Sender: news@sfu.ca (seymour news) Organization: Simon Fraser University, Burnaby, B.C., Canada References: <1994Feb03.220402.109186@ipgaix.unipg.it> Date: Fri, 4 Feb 1994 15:40:17 GMT Lines: 29 peppe@ipgaix.unipg.it (Giuseppe Vitillaro) writes: >I just switched my disk from the an old IDE/SCSI >controller to Adaptec 1542b SCSI controller. >I noted that Adaptec 1542b is doing geometry >translation (1Mb = 1 cyl) and I already have >DOS installed (and I want to keep it). >For what I know geometry translation cannot >be disabled in 1542b. Is that true? If this >is the case should I apply what I found at point >2.5.5 of the faq (that seems a pontentially dangerous >partition machinery)? >Thank for any suggestion, Peppe. >-- >Giuseppe Vitillaro - IBM SEMEA | E-Mail : peppe@unipg.it >University of Perugia Italy | 06100 Perugia Phone:+39.75.585-2799 >--------------------------------------------------------------------------- >All comments/opinions are mine and don't represent those of IBM The 1542 applies geometry translation always, for both DOS and FreeBSD (unlike some IDE controllers), so partition the drive with fdisk or pfdisk and feed FreeBSD the DOS geometry and partition offsets. Works fine. Peter Van Epp / Operations and Technical Support Simon Fraser University, Burnaby, B.C. Canada