Sorry guys, I got it figured out, I extracted the driver pack manually which caused problem. Thanks.

"# DriverPacks.net - MassStorage" did not exist in my BartPE plugin list, so I followed instruction to select "# DriverPack - Press <CONFIG> to enable..." and clicked the button "Config" in BartPE plugins window, it has been running for more than 2 hours and still not finishing, there is no progress bar either so I have no idea how much longer this is going to take, is this normal?

Thanks!
Matt