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Thread: Dual Booting

  1. #1
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    Question Dual Booting

    I want to be able to dual boot from two separate hard drives. I already have one HD with Windows XP Prof. and one HD with Ubuntu. Does anyone know how to do this? All the stuff I've read on Dual Booting is for a single HD. It is a little annoying to open up the desktop case every time I want to switch between Win & Linux. Thanks.

  2. #2
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  3. #3
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    Re: Dual Booting

    Hi,

    Check out this guide to create a grub loader that will boot your XP & Ubuntu drives and allow you to choose between them, which you want to boot:

    https://help.ubuntu.com/community/Re...tallingWindows

    I hope it helps.

    Regards,

    JS
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  4. #4
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    Re: Dual Booting

    Quote Originally Posted by TKOP View Post
    I want to be able to dual boot from two separate hard drives. I already have one HD with Windows XP Prof. and one HD with Ubuntu. Does anyone know how to do this? All the stuff I've read on Dual Booting is for a single HD. It is a little annoying to open up the desktop case every time I want to switch between Win & Linux. Thanks.
    This is very simple to accomplish. The file /boot/grub/menu.lst controls what operating systems can be booted, and which partitions they reside on. So we just need to properly setup your menu.lst.

    First, can you run the following command in Ubuntu and post the results? It will tell us how your hard drives are configured, partitioned, and formatted:

    Code:
    sudo fdisk -l
    If all else fails, use fire.

  5. #5
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    Re: Dual Booting

    The one point that most how-tos fail to make clear is where to install GRUB. It has to be installed to the MBR of whichever disk boots first. If your Windows disk is the first to boot, you would install GRUB to the MBR of that disk and it would point to the menu.lst file on the other disk. Or if the Ubuntu disk is the first to boot, install GRUB to the MBR of that disk and point it to the same disk.
    Break it, fix it, learn something.
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  6. #6
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    Re: Dual Booting

    Quote Originally Posted by Miljet View Post
    The one point that most how-tos fail to make clear is where to install GRUB. It has to be installed to the MBR of whichever disk boots first. If your Windows disk is the first to boot, you would install GRUB to the MBR of that disk and it would point to the menu.lst file on the other disk. Or if the Ubuntu disk is the first to boot, install GRUB to the MBR of that disk and point it to the same disk.
    +1

    Make sure you intall GRUB to the right drive.

    During the Ubuntu install it gives you the option where to install GRUB make sure that it's installed to your boot dive which I'm guessing will be the Win XP drive.
    Last edited by ayenack; June 7th, 2009 at 11:23 PM.
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  7. #7
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    Re: Dual Booting

    Thanks guys. I will follow those instructions and let you know. I will post the results from fdisk soon.

  8. #8
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    Re: Dual Booting

    As a side note, there should be no need to swap over plugs on the HDDs to change boot order. You can do that in BIOS, even on ancient machines.
    Linux Mint 8 64 Bit | Intel Core 2 Duo CPU E8500 @ 3.80GHz (OC) | 4GB Kingston RAM | Asus P5Q Delux Motherboard | Asus EN9800GT (NVIDIA) | WD 120GB / WD 720GB SATA2 HDDs

  9. #9
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    Re: Dual Booting

    Quote Originally Posted by nandemonai View Post
    As a side note, there should be no need to swap over plugs on the HDDs to change boot order. You can do that in BIOS, even on ancient machines.
    of course, the above statement is only accurate if the jumpers are already set correctly and your BIOS "sees" all drives properly...

    then...yes, boot order can be selected via BIOS...

    as always, your mileage may vary depending on your personal driving habits...

    Never give up, never surrender!

  10. #10
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    Re: Dual Booting

    OK guys here's the printout from when I ran fdisk -l for your information.

    Disk /dev/sda: 122.9 GB, 122942324736 bytes
    255 heads, 63 sectors/track, 14946 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Disk identifier: 0x07e1145a

    Device Boot Start End Blocks Id System
    /dev/sda1 * 1 14570 117033493+ 83 Linux
    /dev/sda2 14571 14946 3020220 5 Extended
    /dev/sda5 14571 14946 3020188+ 82 Linux swap / Solaris

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