/boot/grub/grub.cfg in my external HDD

grub.cfg

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function recordfail {
  set recordfail=1
  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
  insmod vbe
  insmod vga
}

insmod part_msdos
insmod ext2
set root='(hd1,msdos6)'
search --no-floppy --fs-uuid --set ef01cb5d-26bf-415e-b7df-10b5d99cdf1b
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=640x480
  load_video
  insmod gfxterm
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='(hd1,msdos6)'
search --no-floppy --fs-uuid --set ef01cb5d-26bf-415e-b7df-10b5d99cdf1b
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
if [ "${recordfail}" = 1 ]; then
  set timeout=-1
else
  set timeout=10
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Ubuntu, with Linux 2.6.35-22-generic' --class ubuntu --class gnu-linux --class gnu --class os {
	recordfail
	insmod part_msdos
	insmod ext2
	set root='(hd1,msdos6)'
	search --no-floppy --fs-uuid --set ef01cb5d-26bf-415e-b7df-10b5d99cdf1b
	linux	/boot/vmlinuz-2.6.35-22-generic root=UUID=ef01cb5d-26bf-415e-b7df-10b5d99cdf1b ro   quiet
	initrd	/boot/initrd.img-2.6.35-22-generic
}
menuentry 'Ubuntu, with Linux 2.6.35-22-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
	recordfail
	insmod part_msdos
	insmod ext2
	set root='(hd1,msdos6)'
	search --no-floppy --fs-uuid --set ef01cb5d-26bf-415e-b7df-10b5d99cdf1b
	echo	'Loading Linux 2.6.35-22-generic ...'
	linux	/boot/vmlinuz-2.6.35-22-generic root=UUID=ef01cb5d-26bf-415e-b7df-10b5d99cdf1b ro single 
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initrd.img-2.6.35-22-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/11_windows ###
### END /etc/grub.d/11_windows ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
	insmod part_msdos
	insmod ext2
	set root='(hd1,msdos6)'
	search --no-floppy --fs-uuid --set ef01cb5d-26bf-415e-b7df-10b5d99cdf1b
	linux16	/boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
	insmod part_msdos
	insmod ext2
	set root='(hd1,msdos6)'
	search --no-floppy --fs-uuid --set ef01cb5d-26bf-415e-b7df-10b5d99cdf1b
	linux16	/boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows NT/2000/XP (on /dev/sda1)" {
	insmod part_msdos
	insmod ntfs
	set root='(hd0,msdos1)'
	search --no-floppy --fs-uuid --set c43036ab3036a3f8
	drivemap -s (hd0) ${root}
	chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.

menuentry "Windows 7 Installer" {
        insmod part_msdos
        insmod ntfs 
        set root='(hd1,msdos1)'
        search --no-floppy --fs-uuid --set 4c20d8f820d8e9ca 
        drivemap -s (hd0) ${root}
        chainloader +1
}

menuentry "Ubuntu Live Installer" {
	insmod part_msdos
	insmod ext2
	set root='(hd1,msdos6)'
	search --no-floppy --fs-uuid --set ef01cb5d-26bf-415e-b7df-10b5d99cdf1b
	loopback loop /boot/ubuntu-10.10-desktop-i386.iso
	linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=/boot/ubuntu-10.10-desktop-i386.iso noeject noprompt --
	initrd (loop)/casper/initrd.lz
}

### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###