how change boot disk ?

hi

i need to install a streamer but i already have 4 device connected on
my ide bus
so i deceide to supress my smaller disk (4Go) whose contain / and mount
it on /dev/hdc3
shall i create same partition on hdc3 thant hda3 ?
shall i use dd if=/dev/hda3 of /dev/hdc3 ?
so i dont know how modify boot sequence

and if i need modify another thing else like /boot

sorry for my poor english and thank's for all

i use Grub boot loader and this is my fstab file :



/dev/hda3 / reiserfs acl,user_xattr 1 1
devpts /dev/pts devpts mode=0620,gid=5 0 0
proc /proc proc defaults 0 0
usbfs /proc/bus/usb usbfs noauto 0 0
sysfs /sys sysfs noauto 0 0
#/dev/cdrecorder /media/cdrecorder subfs
fs=cdfss,ro,procuid,nosuid,nodev,exec,iocharset=utf8 0 0
#/dev/dvd /media/dvd subfs
fs=cdfss,ro,procuid,nosuid,nodev,exec,iocharset=utf8 0 0
/dev/fd0 /media/floppy subfs
fs=floppyfss,procuid,nodev,nosuid,sync 0 0
/dev/hdb /media/cdrom subfs
fs=cdfss,ro,procuid,nosuid,nodev,exec,iocharset=utf8 0 0
#/dev/system/var /mnt/var reiserfs acl,user_xattr
1 2
/dev/hdd1 swap swap defaults 0 0
/dev/hdd8 /root reiserfs suid,dev,acl,user_xattr,exec 0 0
/dev/hdd7 /opt reiserfs acl,user_xattr 1 2
/dev/hdd6 /srv reiserfs acl,user_xattr 1 2
/dev/hdd5 /var reiserfs acl,user_xattr 1 2
/dev/hdd9 /tmp reiserfs acl,user_xattr 1 2
#/dev/hdc2 /local reiserfs acl,user_xattr 1 2
#/dev/hda1 /usr reiserfs acl,user_xattr 1 2
http://127.0.0.1/servlet/webdav.documents /mnt/webdav davfs
user=pfe 0 0
/dev/hdc1 swap swap pri=42 0 0
/dev/hdc2 /usr reiserfs acl,user_xattr 1 2