I have a Hitachi external Hard Drive, powered by 2 USB leads. On my previous (XP) computer, I only needed to plug one of these into a USB socket; however on my new (Windows 8) computer I need to plug both in, otherwise the drive 'complains' with a kind of rhythmic squeaking noise.
When the computer is powered down, the hard drive again makes this noise instead of switching off. It doesn't sound too healthy so I usually end up unplugging the hard drive until next time I boot up, although I don't always remember to do this, so it stays complaining all night.
Now the hard drive sometimes disconnects itself, so I have to unplug and reconnect it - which suggests to me that all this isn't helping.
Any advice, anyone?