Triple-booting?

[don fisher]

As I recall, back before the days of SATA when we used LILO, one used to 
be able to save a copy of the MBR with dd:

dd of=/mbr if=/dev/hdx bs=512 count=1

The boot script was in the first 446 bytes of the MBR, with the iptables 
following. One could restore an overwritten boot sequence with:

dd of=/dev/hdx of=/mbr bs=446 count=1

restoring the first 446 bytes leaving the iptables in tact. This did not 
appear to work when I tried it on an SATA disk. Has the MBA format 
changed, and if so does anybody know what the new format is?

Thanks,
don

Matthew Flaschen wrote:
> Andrew Burgess wrote:
>> Until recently, I was dual-booting Vista and Ubuntu 8.10. However, I've
>> installed the Windows 7 beta on a third partition. When it installed,
>> Windows 7 overrode the GRUB menu (I think) and so I only get Vista and Win7
>> as options on boot. I'm not sure how to repair the GRUB so that Ubuntu will
>> show up . . . or even how to get into Ubuntu! Windows can't read the ubuntu
>> partition, but I'm assuming I could do something to fix it if I booted from
>> a CD.
> 
> That's right.  You can use the same CD you installed from.  See
> tutorials such as
> http://www.howtogeek.com/howto/ubuntu/reinstall-ubuntu-grub-bootloader-after-windows-wipes-it-out/
> and
> http://microdotsagamedev.wordpress.com/2007/06/08/repair-your-grub-loader/
> 
> Post if you have any trouble.
> 
> Matt Flaschen
>