I have a self-powered vwii hdd, but I'm wondering if I still need a y-cable? I'm a bit paranoid, 'cause my previous hdd died at some point. I think the drive was defective, since it was less than a year old. anyway, will using a y cable hurt anything or is it not even worth using since the hdd is self-powered? I'll have to use an extension cable, since the enclosure I chose uses a printer usb 2.0 connection.