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Date:      Tue, 10 Mar 1998 01:37:28 -0300 (EST)
From:      Joao Carlos Mendes Luis <jonny@coppe.ufrj.br>
To:        bde@zeta.org.au (Bruce Evans)
Cc:        bde@zeta.org.au, mike@smith.net.au, current@FreeBSD.ORG, stable@FreeBSD.ORG
Subject:   Re: *HEADS UP* Correction to previous postings.
Message-ID:  <199803100437.BAA04547@gaia.coppe.ufrj.br>
In-Reply-To: <199803100201.NAA26202@godzilla.zeta.org.au> from Bruce Evans at "Mar 10, 98 01:01:54 pm"

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#define quoting(Bruce Evans)
// Summary of the 3 cases where the whole disk is used for FreeBSD:
// 
// Partition table config  Slice# passed by bootblocks  Slice# to use for "/"
// ----------------------  ---------------------------  -------------------------
// Signature != 0xAA55     WHOLE_DISK_SLICE (= 1)       COMPATIBILITY_SLICE (= 0)
// Historical invalid      BASE_SLICE + 3   (= 5)       COMPATIBILITY_SLICE (= 0)
// "Valid" (1 big part.)   BASE_SLICE + N (0 <= N < 4)  BASE_SLICE + N
// 
// User actions in the 3 cases:
// 1. Hope this doesn't happen.  It is very unlikely to happen for boot disks.

Most PC BIOSes (if not all) will not boot from a disk if the first block
does not have the 0xAA55 signature.    Indeed, they will not boot without
a valid MBR.

Have you ever seen such a case ?  Or does this discussion apply to
PC98 (from which I have no info, and don't know if the above is still
true) and Alpha ports ?

// 2. Wait for fixes.
// 3. Same as for cases where the whole disk is not used for FreeBSD - edit
//    /etc/fstab.

					Jonny

--
Joao Carlos Mendes Luis			jonny@gta.ufrj.br
+55 21 290-4698				jonny@coppe.ufrj.br
Universidade Federal do Rio de Janeiro	UFRJ/COPPE/CISI
PGP fingerprint: 29 C0 50 B9 B6 3E 58 F2  83 5F E3 26 BF 0F EA 67

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