Date: Wed, 15 Mar 1995 23:38:25 -0800 (PST) From: Poul-Henning Kamp <phk@ref.tfs.com> To: bde@zeta.org.au (Bruce Evans) Cc: terry@cs.weber.edu, current@FreeBSD.org, rgrimes@gndrsh.aac.dev.com Subject: Re: newfs: sectors per cylinder (4096) disagrees with disk label (36) Message-ID: <199503160738.XAA10444@ref.tfs.com> In-Reply-To: <199503160703.RAA19633@godzilla.zeta.org.au> from "Bruce Evans" at Mar 16, 95 05:03:29 pm
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> >1) The device-driver may use a geometry(A) to access the disk. > > >2) The UFS may be created with a geometry(B) != geometry(A) > > >3) The device driver may need to read the geometry(A) from the disklabel, > > because the BIOS lies and the drive is too dumb to answer the question. > > The disklabel is the only place this can come from. > > Only on old devices that are currently unsupported because they also > require bad144 support. > > Anyway, for sliced devices, geometry(A) is stored in the label for the > whole disk and is not necessarily related to the geometries(B) stored > in the BSD labeled slices on the disk. You can put a 4096 * 1 geometry > in the slices is that is good for file systems. Uhm, is "label for the whole disk" the MBR ? If so, how do we handle the >1023 stuff ? -- Poul-Henning Kamp <phk@login.dknet.dk> -- TRW Financial Systems, Inc. 'All relevant people are pertinent' && 'All rude people are impertinent' => 'no rude people are relevant'
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