Hey,
I just joined to say thanks, this worked perfectly on my lifebook without any drives whatsoever - that's no CD, no floppy, and won't boot from USB.
I just wanted to make a suggestion to those who are doing this in order to install an OS on a laptop such as the one I have:
On another laptop with a CDROM and a working copy of XP, I went to install a fresh copy of XP and made sure it copied the source files to the installation disk - basically to the point where you boot and it will continue the installation.
Then I took an external usb adapter, hooked up a "blank" hard drive, and formatted and partitioned the drive.
I booted ubuntu, and followed your instructions - making *SURE* to make the partition identical, and after several hours (usb 1.1 is slowwww - 12000 seconds) I just dropped the hard drive into the lifebook and proceeded to finish installing XP. No problems, no worries, no extra steps.
Note > Several hours for 12gb. USB 1.1 is severely overrated.