[HELP] Sata External USB HDD BT2 Install

[camphortree]

i install bt2.iso via Vmware 6 .
i have a external sata usb hdd, so i attached it into Vmware(using whole disk), and followed livedcd install instructions.

/dev/sda1 * linux 83
/dev/sda2 swap 82
/dev/sda3 linux 83
umount /dev/sda*

mkfs.ext3 /dev/sda1
mkfs.ext3 /dev/sda3
mkswap /dev/sda2
swapon /dev/sda2

bt ~ # cd /mnt
bt mnt # mkdir boot
bt mnt # mkdir bt2f
bt mnt # mount /dev/sda1 boot
bt mnt # mount /dev/sda3 bt2f

Source (BackTrack CD): <leave this blank>
Install BackTrack to: /mnt/bt2f
Write MBR to: /dev/sda
Install"

after installation complete.i remove the iso img,restart the vm, and it works well. but while i reboot my pc,(already have selected using usb hdd to bootup [HTS541612J9SA00, it's a sata 120gb external hd]), it works well at the beginning, after a while i get a kernal panic like this:

md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
RAMDISK: Couldn't find valid RAM disk image starting at 0.
VFS: Cannot open root device "803" or unknown-block(8,3)
Please append a correct "root=" boot option
Kernel panic - root not syncing: VFS: Unable to mount root fs on unknown-block(8,3)

and system hangs up.interupt receiving any input.
i reboot to windows and boot it via vmware, it working normally.
i also tried change lilo.conf root=/dev/sd* or root=/dev/hd*
(* means [ax,bx,etc])
i'm a newbie in linux,i think this would be a sata driver problem.my pc chipest model is ICH7
this question make me house arrest,could any one help me here.thx very much.

[bofh28]

try adding rootdelay=15 to the kernel line. It works for external usb drives. I am not sure about esata, but I am looking into purchasing one so I would like to know if this works.

Thanks,