why u using usb?
usb has onyl caused problems with me m8,
if ur geting wobblys then use a normal cat 5cable crosswired, so they are networked together make sure the workgroup is sameand ip addresses are similar like :
laptop : 192.168.0.1
pc : 192.168.0.2
subnet masks : 255.255.255.0
then share both hard drives and to connect to each other just click network neighbourhood, and click workgroup.
or from laptop type in your internet explorere :
and the sahred hard drive will appear, map it by right clicking and u have talking between both pc's