I have a 250GB HD in my iMac G5. I have 3 partitions: the OSX Partition is 75GB, the 2nd Partition is 130GB, and the 3rd is the remainder. Lately it seems that whenever I'm transferring large files (video mainly) b/t the partitions (or from my iMac G5 to my PB) I get a clicking noise from iMac....seems to be the hard drive. Has anyone else run into this? Should I be concerned? Possibly a failing hard drive? The only other time I've ever heard anything similar is on my Firewire HD when I eject it from my desktop....it clicks to let me know it has been ejected......but I've never heard this sound with any other hard drives in any of the Macs I've had. Thanks!