It doesn't matter on which the device the OS is... you install the bootloader on /dev/hda (if first drive is IDE) or /dev/sda (if first drive is SCSI/SATA), and the installation program should already recognize where Winblows is already installed and set up a menu item for it. Even if autodetect somehow fails, it's only a matter of modifying grub.conf/menu.lst to contain two lines:

1) root (hd<DISKNUMBER>,<PARTITIONNUMBER>)
2) chainloader +1

for the Winblows menu item...

נמאס לכם לזכור סיסמאות? לחצו כאן!