I just purchased a Western Digital Passport 120Gb external HD. My 15" MacBook doesn't recognize the drive. My XP system at work picks it up no problem. The WD support site states that the Mac OS may take awhile to initalize a new drive but it doesn't say how long that may take. Disk utility doesn't see the drive either. The USB ports both powe up my 30GB Ipod so I don't think it's a powe issue. Anyone have any ideas? Any help would be appreciated. Thanks.