Date: Sat, 25 Mar 1995 13:29:20 +0100 (MET) From: J Wunsch <j@uriah.heep.sax.de> To: root@deadline.snafu.de (Andreas S. Wetzel) Cc: freebsd-bugs@FreeBSD.org Subject: Re: How to solve weirdities about disk geometries? Message-ID: <199503251229.NAA01624@uriah.heep.sax.de> In-Reply-To: <m0rsUMn-000DVqC@deadline.snafu.de> from "Andreas S. Wetzel" at Mar 25, 95 12:50:53 pm
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As Andreas S. Wetzel wrote: > > I often wondered about that disk-geometries since I use 2.xx FreeBSD. > During boot time the kernel says that my first SCSI disk would have: > > scbus0: (bt0:0:0): "FUJITSU M2694ES-512 812A" is a type 0 fixed SCSI 2 > sd0(bt0:0:0): Direct-Access > sd0(bt0:0:0): 1033MB (2117025 sectors), 1819 C 15 H 77 S/T 512 B/S > > But when I take 1819 cylinders with 15 heads and 77 sectors each, I only > get 2100945 total sectors. This is since modern disks do not have a constant number of sectors per track. You can hand-edit the disklabel (disklabel -w -e), and manually enter the correct (larger) number of total sectors. Once i did this, disklabel also agreed for me to write a new bootstrap. :) I think the disklabel code from sysinstall should enter the correct values for total # of sectors, rpm (at least, the rough guess of 3600), and interleave (1). I've already filed a problem report for this. (Something like ``disklabel refuses to write bootstrap''.) -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ Never trust an operating system you don't have sources for. ;-)home | help
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