Re: grub and dos, windows, and linux?

[adrian15]

En/na Felix Miata ha escrit:
> On 2008/10/21 20:14 (GMT+0200) adrian15 composed:
>
> > I would make a:
> > sda1 EXT3 partition /boot
> > sda2 FAT12
>
> FAT12 (type 0x01) only works if you want your DOS partition to be very small,
> ~16M or less. FAT16 (0x04) works from 16M to 32M. FAT16B (0x06) goes from 32M
> to 2G. FAT32 is good for more than 2G, and less.
I just thought that DOS was only compatible with FAT12 but now I 
remember it I think that you can have DOS on FAT16. However you cannot 
have DOS on FAT32. Isn't it?

> > sda3 WINXP
>
> If you do that, you'll almost certainly never be able to reinstall Windoz
> without wiping out Linux first. All the WinXP installation CDs I've used
> apparently check for the presence of Grub on the first primary, and black
> screen instead of proceeding when I boot them.
Even if GRUB is in a ext3 partition ? Black screen ?
Hummm...
I have not so much experience on installing Windows XP so you might be 
right.
> > Make sure that sda is an IDE partition. As far as I know DOS does not 
> > support SATA drives.
>
> DOS uses the PC BIOS for ATA I/O. DOS has no idea what kind of ATA interface
> is hiding behind the BIOS. DOS might be incompatible with AHCI, which I've
> never yet tried, but it works fine with both SATA and legacy modes on SATA
> HDs on the several systems I've tried DOS on.

You are right. I was so stupid. It's true. DOS uses PC BIOS I/O so...
If you can run Grub legacy on a PC you can run DOS. (The only problem is 
80386 architecture support I suppose).

adrian15
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