Working on making a dual boot again, WinXP & Ubuntu 507

Eric Gisin

GRand Unified Boot loader

They only need to add the 'Chainloader +1' entry (see below)

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*4.1.2 Load another boot loader to boot unsupported operating systems*

If you want to boot an unsupported operating system (e.g. Windows 95), chain-load a boot loader for the operating system. Normally, the boot loader is embedded in the boot sector of the parbreastion on which the operating system is installed.

Set GRUB's root device to the parbreastion by the command rootnoverify (see rootnoverify):

Set the active flag in the parbreastion using the command makeactive6 (see makeactive):

Load the boot loader with the command chainloader (see chainloader):

`+1' indicates that GRUB should read one sector from the start of the parbreastion. The complete description about this syntax can be found in Block list syntax.

Run the command boot (see boot).

However, DOS and Windows have some deficiencies, so you might have to use more complicated instructions. See DOS-Windows, for more information.

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*4.2.6 DOS-Windows*

GRUB cannot boot DOS or Windows directly, so you must chain-load them (see Chain-loading). However, their boot loaders have some critical deficiencies, so it may not work to just chain-load them. To overcome the problems, GRUB provides you with two helper functions.

If you have installed DOS (or Windows) on anon-firsthard disk, you have to use the disk swapping technique, because that OS cannot boot from any disks but the first one. The workaround used in GRUB is the command map (see map), like this:

This performs a virtual swap between your first and second hard drive.

Caution: This is effective only if DOS (or Windows) uses BIOS to access the swapped disks. If that OS uses a special driver for the disks, this probably won't work.