pretty much what slaving your hard drive means is taking it out of the emachine and then sticking it into your new machine as a secondary hard drive.
Master is the hard drive that the computer boots from and slave is the an extra hard drive. Of course if you prefer not to mess with internal item of the computer, you can always just get an external casing for the hard drive and use the current hard drive as an external.
Either way, we can help you with that too
