i've noticed that recently my Microsoft Wireless mouse (with transceiver) lags when my external HDD USB v3.0 although the trackpad works without any problem. If I unplug the external HDD, the mouse works without any problem. I've tried using a Logitech Wireless mouse (with transceiver), the same thing happens.
It wasn't like this before. My OS is v10.8.4
any idea what's wrong?
MacBook Pro (13-inch Mid 2012), OS X Mountain Lion (10.8.4)
