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Date:      14 Sep 2001 08:16:02 -0700
From:      swear@blarg.net (Gary W. Swearingen)
To:        Salvo Bartolotta <bartequi@neomedia.it>
Cc:        Kory Hamzeh <kory@avatar.com>, Brett Waldon <necro666@sbcglobal.net>, questions@FreeBSD.ORG
Subject:   Re: i dont unsterstand the disk label maker
Message-ID:  <jhlmjh951p.mjh@localhost.localdomain>
In-Reply-To: <1000474760.3ba2088862951@webmail.neomedia.it>
References:  <1000474760.3ba2088862951@webmail.neomedia.it>

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Salvo Bartolotta <bartequi@neomedia.it> writes:

> N.B. FreeBSD requires (at least) one DOS **primary** partition, ie at least 
> one slice. Some people wrote that they succeeded in making use of a (DOS) 
> extended partition, ie with some hacking. I haven't tried such an approach so 
> far; however, that is decidedly NOT for the faint of heart.

A minor correction to the correction:

By (M$DOS) "extended partition", "logical partition" is probably meant;
that is, a sub-partition of a single extended partition which is one
of up to four primary partitions.


BSD slice <=> M$DOS primary partition in the sense that they occupy the
same disk space and have similar disk partition table entries.

BSD slice <=> M$DOS extended partition in the sense that they both contain
sub-partitions, except that BSD supports four instead of M$DOS's one.

BSD partition <=> M$DOS logical partition except for the difference in the
number supported.

M$DOS logical disk = M$DOS non-extended primary and logical partitions.


P.S. The above breaks down a bit when sliceless (dangerously dedicated)
disks are considered.  The best analogy is probably that the entire disk
corresponds to a BSD slice and M$DOS extended partition and that a BSD
partition still <=> M$DOS logical partition, but I suspect that the
intuitive analogy is that in this case only, BSD partitions <=> M$DOS
primary partitions with a limit of 7 instead of 4.

P.P.S. Slices and sliceless disks may have up to 7, not 8, partitions by
my count which does not include the virtual partition, "c", which
overlaps all the others.

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