Yesterday my new External harddrive arrived, and I was faced with a couple of dissapointments. First of all, advertised size of the drive is 360GB, but windows only says that there is 298GB there - is that normal? And secondly, the harddrive came with a power cord and an adapter... I assumed it gets all the power it needs from the USB cable... Is it also normal that the external harddrives come with powercords?