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OfflineFungi_x
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Boot Record Fucked up Or Something?
    #4604133 - 08/31/05 04:56 PM (11 years, 6 months ago)

My computer won't boot anything but this ubuntu live DVD. It all started when I deleted a partition at the beginning of my drive. I think I fucked up the boot record or something. I tried booting into the recovery console and creating a new mbr and I did a bunch of other crap but nothing worked. One thing said there was damage to partitions. I don't know what to do. There are things on that drive I need. I need a way to gain access to them then move them on disc.


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OfflineManicDelirium
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Re: Boot Record Fucked up Or Something? [Re: Fungi_x]
    #4604671 - 08/31/05 07:41 PM (11 years, 6 months ago)

what is the error message when you try to boot it ?

"DISK BOOT FAILURE" ?


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InvisibleMarioNett
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Re: Boot Record Fucked up Or Something? [Re: ManicDelirium]
    #4605441 - 08/31/05 09:53 PM (11 years, 6 months ago)

Can you still mount partitions and read the drive from the Ubuntu disk?

What brought this problem on?

If you accidentally deleted the patition table, as I once did, you can use a linux utility called "gpart" to rebuild it. It might even be on your Ubuntu disk already. And if you can download and burn the Ultimate Boot CD, you'll find some partition/MBR editing tools on there that might be useful. That's the second time in five minutes that I've recommended the UBCD. Everyone who has a computer should have a copy of that.


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OfflineFungi_x
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Re: Boot Record Fucked up Or Something? [Re: ManicDelirium]
    #4606520 - 09/01/05 01:00 AM (11 years, 6 months ago)

Quote:

ManicDelirium said:
what is the error message when you try to boot it ?

"DISK BOOT FAILURE" ?




It don't give me any error. It searches the CD drive for a disc then just sits there.


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OfflineDrink_Punk_Soda
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Re: Boot Record Fucked up Or Something? [Re: Fungi_x]
    #4606530 - 09/01/05 01:03 AM (11 years, 6 months ago)

Hmm.. change boot order to something other than CD first.


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OfflineSeussA
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Re: Boot Record Fucked up Or Something? [Re: Fungi_x]
    #4607174 - 09/01/05 06:52 AM (11 years, 6 months ago)

Are you dual booting into more than one OS, or just running ubuntu. I will assume that you are only using the single OS.

Here is a quick lesson on the boot process to help you figure out what is going on. When the system is turned on, the first sector (MBR) of the hard drive is read. These 512 bytes simply relocate themselves in memory, look for an active partition, load the first sector of the active partition (BS) into memory, and start execution of the new code.

Because the MBR only has 512 bytes to work with, it can't do very much. It uses BIOS to do the disk IO. BIOS is pretty stupid, and has been hobbled by backwards compatibility. Because of this, BIOS can only access the first few gigabytes of any hard drive. (Newer versions of BIOS can access larger disk areas, but few OS support these newer BIOS because of backwards compatability problems.)

When you have an OS on a large drive, the "boot code" for that OS must be located at the start of the drive where BIOS can access the information. Most versions of linux accomplish this by placing a very small partition at the head of the disk. This partition contains the kernel image, LILO, and a config file or two.

If you blew this partition away, your system will no longer boot. You will need to figure out how to recreate the original setup to get your OS to boot. You will have to find the specifics from somebody else, but the basic idea is to create the partition, set it as active, newfs the partition, copy the boot files across, rerun lilo, and cross your fingers on reboot.


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OfflineFungi_x
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Re: Boot Record Fucked up Or Something? [Re: Seuss]
    #4608845 - 09/01/05 04:53 PM (11 years, 6 months ago)

I deleted the first partition that had win98 on it. i assume it had the boot info on it. the second partition had win-xp. My goal was to remove the win98 partition then create a Linux partition and install ubuntu. But shit went down hill and now I'm booting from ubuntu live.

I was able to access the files on the ntfs partitions that i wish to keep but I can't move them with this live cd.


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InvisibleMarioNett
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Re: Boot Record Fucked up Or Something? [Re: Fungi_x]
    #4609850 - 09/01/05 08:55 PM (11 years, 6 months ago)

Ok,this is not such a big deal then. If you can still read the partitions, that means the partition table is intact.

Either
A: You somehow erased the MBR as well as the first partition
or (more likely)
B: There was some kind of bootloader in that first partition that gave you the choice of win98 and winxp, and that is gone now.

I suggest you go ahead and install Ubuntu. It will install LILO or GRUB into the MBR, which will give you the choice of booting Ubuntu or WinXP. This will make whatever bootloading setup you had before obsolete.


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OfflineFungi_x
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Re: Boot Record Fucked up Or Something? [Re: MarioNett]
    #4611798 - 09/02/05 11:00 AM (11 years, 6 months ago)

I don't have any partitions made to install uduntu onto. I was going to create the swap and root partitions after I deleted the win98 partition. All the partitions I have now contain data that I MUST NEVER lose.

I don't know what to do :shrug: I can't just install a new boot loader from this live cd?


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OfflineSeussA
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Re: Boot Record Fucked up Or Something? [Re: Fungi_x]
    #4612997 - 09/02/05 05:23 PM (11 years, 6 months ago)

If you really cannot loose your data, then you need to get another hard drive. Take that hard drive out of your computer, install everything you want onto the second hard drive, then reattach the original hard drive as a slave. You will be able to mount the second hard drive and get the data. If you try to play with the current drive in the current state, you will most likely loose your data.


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InvisibleMarioNett
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Re: Boot Record Fucked up Or Something? [Re: Seuss]
    #4614092 - 09/02/05 10:57 PM (11 years, 6 months ago)

Quote:

I was going to create the swap and root partitions after I deleted the win98 partition.




This is exactly what I'm suggesting you do. You can try running "qtparted" or "cfdisk /dev/hda" from Ubuntu to make your partitions yourself, though I imagine the Ubuntu installation process gives you another chance to do this. Ubuntu installation will also give you a bootloader.

It's possible to install just a bootloader as well, but you need a linux partition on which to store the configuration for it, AFAIK. It'll be better and easier to just install Ubuntu and let it handle that.


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