I've got a 500 GB external hard drive on a Dual G5. I initially partitioned it for 400 GB and 100 GB. The 100 GB served as a SuperDuper backup clone. I then upgraded the system from 10.3 to 10.5 and got Time Machine running on the 400 GB partition. So now, I have a 100 GB partition of no particular use -- I'm not using SuperDuper! right now. I'm uncertain how -- if possible -- I should re-partition the external drive. Or if I should leave well enough alone. The G5's internal hard drive is 100 GB with about 50 GB used. I could buy SuperDuper and use it do to incremental, exact copies to the 100 GB partition. That would be pretty good for a while. And leave TM to use the 400 GB partition. But I was wondering if I can repartition the drive back to a full 500 GB for sole TM use, without destroying the current TM data? Any suggestions or technical tips are welcome. Thanks!