yeah but if u use partition magic when an os is installed it will always ask you to format the drive because your splitting it in half.
I wouldnt advise doing it anyway unless you really wanted linux on there.
Anyway some webbooks have cdroms you could always buy an external one. Or just take the hdd out and put it into another computer and install it from that.
Ive never used a usb to install an os but i guess its possiable.