Grub problem, can't boot.

[Erik P. Olsen]

Mikkel L. Ellertson wrote:
> Erik P. Olsen wrote:
>> I know it's my own fault but can't see a way out. I made an entry to 
>> grub.conf of an F7 system that I am currently building. The purpose of 
>> this entry should be to launch BookManager. I have tried many 
>> variations to no avail and at this last time I got the idea from some 
>> grub documentation that I should code the entry as:
>>
>> Title BookManager
>>       map (hd0) (hd1)
>>       map (hd1) (hd0)
>>       rootnoverify (hd0,1)
>>       makeactive
>>       chainloader +1
>>
>> All my (stupid) attemps did not launch BookManager but did no other 
>> harm. It was not till I added the two map statements that I got the 
>> problem that after the first attempt to load BM I was no longer able 
>> to boot the F7 system. Clearly the statements had ruined my boot 
>> loader somehow. Is there a way to rectify the damage? I had not 
>> expected that this would cause a permanent damage to the system.
>>
>> Thank God I am able to boot my old FC5 system but my two F7 systems 
>> are now inaccessible.
>>
>> Please help! If I have to reinstall the systems (which I hope I can) 
>> it will set me back several weeks :-(
>>
> I am not sure I understand the problem. If the map statements are just 
> inside the BookManager section, then they should not affect the other 
> boot options. If they are in the global section, then they will. In any 
> case, you should be able to boot with the install CD/DVD in the rescue 
> mode, and edit the grub configuration. You also have the option of 
> booting with a live CD and doing the same thing. If you have a separate 
> /boot partition, you will just need to mount that and edit the 
> configuration file.
> 
> You also have the option when you have the Grub menu to enter your own 
> Grub commands, and boot the F7 system. This requires more knowledge of 
> your system, because you end up entering the commands that make up the 
> menu entry. If you did put the map commands in the global section, you 
> should be able to add the map commands to your F7 menu entry and boot 
> the system so you can fix it.
> 
> In any case, there is no need to re-install.

OK, I'll start trying to correct my F7 test system. When booting into it I get 
into a grub prompt and if I manually enter the statements which normally would 
initiate the boot, i.e. "root (hd1,0)" I get the message:

Filesystem unknown, partition type 0x93

This is clearly wrong since it should have been 0x83 but how can I correct it?

-- 
Erik.