The -x flag is for booting into safe mode.

For your SATA- Controller you´ve to find out which kext will be needed.
I don´t know which kext is needed for virtual box and i also don´t know if there is any that will work. I just know that there is a solution to get it working in vmware.

You have to integrate it into your boot cd.
How you integrate it belongs to your boot-cd but usually kexts will be stored in Extra/Extensions or in System/Library/Extensions.