SATA with linux ext3, and IDE with Win XP using FAT32.  I used fat32 for windows bcause it makes it easier to share the filesystem with linux. I rarely use windows, so any performance issues aren't that important to me. This works for me.

[bomr@localhost ~]$ /sbin/fdisk -l /dev/sda

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2           17991       19457    11783677+   c  W95 FAT32 (LBA)
/dev/sda3              14         143     1044225   82  Linux swap
/dev/sda4             144       17990   143356027+   f  W95 Ext'd (LBA)
/dev/sda5             144       17990   143355996   83  Linux

Partition table entries are not in disk order
[bomr@localhost ~]$ /sbin/fdisk -l /dev/hda

Disk /dev/hda: 15.0 GB, 15020457984 bytes
16 heads, 63 sectors/track, 29104 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1       29103    14667880+   c  W95 FAT32 (LBA)
 

[bomr@localhost ~]$ more /boot/grub/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/sda5
#          initrd /initrd-version.img
boot=/dev/sda1
default=1
timeout=15
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora Core (2.6.12-1.1381_FC3smp)
        root (hd0,0)
        kernel /vmlinuz-2.6.12-1.1381_FC3smp ro root=LABEL=/ rhgb quiet
        initrd /initrd-2.6.12-1.1381_FC3smp.img
title Fedora Core (2.6.9-1.667)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-1.667 ro root=LABEL=/ rhgb quiet
        initrd /initrd-2.6.9-1.667.img
title Windows XP
        rootnoverify (hd1,0)
        map (hd0) (hd1)
        map (hd1) (hd0)
        chainloader +1

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