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Re: restoring MBR

On Sun, 31 Jul 2011 17:19:31 +0200, Tomas Kral wrote:

> On Sun, 2011-07-31 at 14:06 +0200, Camaleón wrote:
>> On Sun, 31 Jul 2011 20:14:17 +1000, Andrew McGlashan wrote:
>> > On Sat, July 30, 2011 6:40 am, Camaleón wrote:
>> >>>>> One of my (home made) overnight cron jobs does this:
>> >>>>>
>> >>>>> dd if=/dev/sda \
>> >>>>>         of=$DST/mbr_backup.bin \
>> >>>>>         bs=512 \
>> >>>>>         count=1 >> $LOG 2>&1
>> > 
>> > Okay, well this script isn't perfect and it sure won't help after the
>> > problem, but it will save all possible MBRs and fdisk output for a
>> > bunch of candidate disks:
>> (...)
>> This should be done _at install time_ when things can badly break. Once
>> you've lost your MBR making a backup of the _wrong_ MBR is of course
>> useless.
> Not sure if I am quite in the subject.
> But in the old Potato days, the installer always asked to stick in a
> floppy disk to write a new MBR on it. Leaving hard drive untouched.

Sure. The expert installer has the option to do not install any 
bootloader or to install it on a partition instead MBR. Not sure what 
happened to the OP but it seems that finally the MBR was replaced somehow.

> Just in case something went wrong with the newly installed system, user
> could always boot back in the old system, just by removing the floppy
> from the drive.
> Also, there used to be command grub-floppy.

Yes, there are many options available. For instance, I removed my 
notebook hard disk when I installed wheezy on external USB disk... just 
in case ;-)

But regardless the option the user select at install time (do not install 
any bootloader, install it in a partition or another place or just 
putting it into MBR), it would be nice the installer makes a copy of the 
original MBR and leaves it under "/boot".



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