MBR

[Burke, Thomas G.]

That's why I said you need to have the bootable floppy...  Anyhoo, nbd.

-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com]On Behalf Of Ed Wilts
Sent: Wednesday, May 18, 2005 10:01 AM
To: General Red Hat Linux discussion list
Subject: Re: MBR



On Wed, May 18, 2005 at 07:18:40AM -0400, Burke, Thomas G. wrote: 
> doing an fdisk /mbr shouldn't hurt you physically, in fact it is quite 
> useful for when the master boot record gets corrupted.  Unfortunately, 
> it wipes out lilo in the boot record, so you can't boot without a 
> disk. 

It wipes out both grub and lilo but your first sentence is also true - 
it doesn't hurt you physically.  I did an fdisk /mbr when I was 
studying for my RHCE to see how long it would take me to recover (not 
long).  After you've wiped out the mbr, boot into rescue mode and do a 
grub-install /dev/hda and you're done. 

> If you have a disk that will allow you to boot to the normal OS & have 
> everything mounted, do the following: 

> 1) fdisk /mbr 

You can do this from a Windows boot floppy. 

> 2) reboot into single user mode 

You can't boot into single user mode after wiping out the mbr - it's the 
master BOOT record that you've just destroyed. 

-- 
Ed Wilts, RHCE 
Mounds View, MN, USA 
mailto:ewilts at ewilts.org 
Member #1, Red Hat Community Ambassador Program 

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