Date: Mon, 17 May 1999 17:42:47 +0300 From: Ruslan Ermilov <ru@ucb.crimea.ua> To: Wayne Cuddy <wayne@crb-web.com> Cc: FreeBSD Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: update boot block after 'make buildworld' Message-ID: <19990517174247.D3078@relay.ucb.crimea.ua> In-Reply-To: <Pine.LNX.3.95.990517094712.23801A-100000@crb.crb-web.com>; from Wayne Cuddy on Mon, May 17, 1999 at 09:53:46AM -0400 References: <19990517110551.D14592@relay.ucb.crimea.ua> <Pine.LNX.3.95.990517094712.23801A-100000@crb.crb-web.com>
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On Mon, May 17, 1999 at 09:53:46AM -0400, Wayne Cuddy wrote:
> Yes, you are correct I will do this after installworld. I am using the NT
> boot manager to read a file I created with 'dd' that consists of the first 512
> bytes of the root partition. I don't want to write of the master bootblock of
> the first disks as to leave the NT boot manager accessible. Does the below
> command change in this situation?
>
> Thanks for your input,
> Wayne
1. disklabel -B will install new bootblocks (/boot/boot1 and /boot/boo2).
2. disklabel -B will not overwrite an existing boot manager.
3. /boot/boot1 is a 512-byte image of the boot block #1 (aka boot-sector),
and it's exactly what you want for the NT loader to eat.
4. There are 3 ways to overwrite an existing boot manager in FreeBSD:
1) `sysinstall' can install the FreeBSD boot manager, which will allow
you to choose the partition to boot from. It is hardcoded into
`sysinstall' at the compile time from /boot/boot0 image.
2) `sysinstall' can install the standard MBR (no boot manager), which is
built into it;
3) `fdisk -b' command will install _another_ standard MBR, which is
built into `fdisk'.
P.S. Why we need two different `standard' MBRs?
--
Ruslan Ermilov Sysadmin and DBA of the
ru@ucb.crimea.ua United Commercial Bank
+380.652.247.647 Simferopol, Ukraine
http://www.FreeBSD.org The Power To Serve
http://www.oracle.com Enabling The Information Age
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