I just updated to 10.5.6. When I restarted my iMac my external hard drive (which is split into two partitions - one for storage, one for Time Machine) does not mount. Disk Utility does show the hard drive and only one of the partitions (the storage one). I've verified it which shows no problems. I've tried to connect it with both FW 800, FW 400 and USB to no avail. So I'm thinking this was the 10.5.6 upgrade, right? Well I've just tried to connect it to my MacBook (which I've not upgraded yet) and the same thing described above happens. I've never connected to the MB before so I don't know it it is the OS upgrade. Any ideas? Help is much appreciated. I hope my all my media/back up isn't gone.