iMac i7 27" Cannot see WD external even though the drive was formated on this machine. Newer MBA 13" i7. Can see the drive w/o issue. ls /Volumes does not show the drive on the iMac. Disk utility does not see it. Light on the drive just blinks. Pulses. Seems, on occasion, to hang ny Eyetv. Any ideas, please and thank you?