Date: Fri, 18 Oct 1996 21:48:01 +0200 (MET DST) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-hackers@freebsd.org (FreeBSD hackers) Subject: Re: 2.2-961014-SNAP install problem Message-ID: <199610181948.VAA27562@uriah.heep.sax.de> In-Reply-To: <199610181418.AAA11364@godzilla.zeta.org.au> from Bruce Evans at "Oct 19, 96 00:18:13 am"
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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 <= <total number of blocks on drive>. 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. ;-)
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