Hello, I've done a good 2 days of research on this and haven't found completely acceptable results. My issue is that my external hard drive (Rugged Lacie 500 GB), has decided for no good reason to not mount unless it's in a mounting mood. I don't know what triggers this behavior and it's been going on for a few days. Here's all I know: This seems to happen only when I use firewire connections. If it mounts, great. If not, nothing comes up on finder. Last time it didn't mount on my Macbook Pro (10.5.8), it still registered in my Disk Utility and I was able to manually mount it there (I right clicked both of the drive's partitions and selected mount). The last time I tried to mount it at work (different computer) it would not even come up in Disk Utility. The strange thing is that every time it doesn't mount, I can hear it spin normally, with no acoustic anomalies. Even stranger: every time it fails to mount via firewire, I have no problems mounting it via USB. And just because it's not mounting on a certain computer via firewire, doesn't mean it won't mount on the next. I'm perplexed. At first I thought my mac's firewire port was failing but now I am sure this is some fault within the ext HDD. Before anyone asks, yes I've tried restarting, yes I've tried different firewire cables. I backup data and format the hdd in hopes this will fix it, but does anyone know if this is a hardware issue? What could cause it to behave so strangely?