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From: chris@umcp-cs.UUCP (Chris Torek)
Newsgroups: net.unix-wizards
Subject: Re: Location of partition table on disk
Message-ID: <4158@umcp-cs.UUCP>
Date: Sun, 2-Nov-86 16:00:38 EST
Article-I.D.: umcp-cs.4158
Posted: Sun Nov  2 16:00:38 1986
Date-Received: Tue, 4-Nov-86 01:27:35 EST
References: <8102@sun.uucp> <1073@cit-vax.Caltech.Edu>
Reply-To: chris@umcp-cs.UUCP (Chris Torek)
Organization: University of Maryland, Dept. of Computer Sci.
Lines: 17

In article <1073@cit-vax.Caltech.Edu> mangler@cit-vax.Caltech.Edu
(System Mangler) writes:
>Putting the partition info in the inode is a great idea (no limit
>on the number of partitions) but the bootstrapping problems are real.
...
>Looks like we need a "partitions" block, someplace that won't get
>overwritten.  So where?  What sector number does Ultrix use?

Ultrix uses the last sector in the first superblock, or in other
words sector 31.  This turns out to be bad for a number of reasons;
the consensus for 4.4 appears to be to use block 0, and just hope
that no one ever needs more than $k$ bytes of boot code ($k$ is
currently 64, which seems rather small to me).
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7690)
UUCP:	seismo!umcp-cs!chris
CSNet:	chris@umcp-cs		ARPA:	chris@mimsy.umd.edu