From owner-freebsd-hackers Fri Oct 18 12:51:58 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id MAA19353 for hackers-outgoing; Fri, 18 Oct 1996 12:51:58 -0700 (PDT) Received: from irz301.inf.tu-dresden.de (irz301.inf.tu-dresden.de [141.76.1.11]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id MAA19336 for ; Fri, 18 Oct 1996 12:51:48 -0700 (PDT) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by irz301.inf.tu-dresden.de (8.6.12/8.6.12-s1) with ESMTP id VAA04628 for ; Fri, 18 Oct 1996 21:51:32 +0200 Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id VAA23745 for freebsd-hackers@freebsd.org; Fri, 18 Oct 1996 21:51:31 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.7.6/8.6.9) id VAA27562 for freebsd-hackers@freebsd.org; Fri, 18 Oct 1996 21:48:01 +0200 (MET DST) From: J Wunsch Message-Id: <199610181948.VAA27562@uriah.heep.sax.de> Subject: Re: 2.2-961014-SNAP install problem To: freebsd-hackers@freebsd.org (FreeBSD hackers) Date: Fri, 18 Oct 1996 21:48:01 +0200 (MET DST) Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: <199610181418.AAA11364@godzilla.zeta.org.au> from Bruce Evans at "Oct 19, 96 00:18:13 am" X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E X-Mailer: ELM [version 2.4ME+ PL17 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk As Bruce Evans wrote: > >not higher than the medium capacity. In this case, the ``dangerously > >dedicated'' mode is the only mode where you can use all the blocks of > >the medium > > No, `C' is not recorded anywhere (except possibly for MFM/ESDI/IDE > disks), there is no requirement that C*H*S <= the medium capacity, > and no advantage for the dangerously dedicated mode. Everything else than dangerously dedicated mode insists on wasting a bunch of sectors in the first ficticous cylinder, and all the sectors after the last complete ficticous cylinder, for DOS compat sake. > (which is normally larger than anything that could be > >expressed as a product C*H*S where all the elements are integer > >numbers). > > No, medium sizes are normally smaller than 1024*255*63 (almost 8GB). That wasn't the question. It's only that the integer product of C*H*S is <= . Since the installation tool uses C*H*S as the number of blocks on drive, it wastes space. (Newfs wastes space, too, since it can also only think in terms of cylinders.) -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)