I have got a 60GB external HD this week. However, when I connect the HD to my computer( PowerMac G4, AGP Graphic, 400MHz with OS 9.2 and OS X.2), there is not disk image on my desktop. But the Apple System Profiler read the this USB device as USB 2.0 storge device. So what should I do? This is a 2.5" external HD. Is it only can use for notebook?