I just bought an external hard drive (Silicon Power Shockproof 1T drive) as a backup drive. I want to partition half of it for Time Machine and half of it as storage. I started up Disk Utility and the partition button is grayed out. After looking through the forums, I realized I had to erase the drive in order to partition it (it came with a FAT32 file system). I was able to erase the physical volume but the partition button was still gray so I tried to erase the physical disk but Disk Utility would give me an error when I try to do this. The output I get from the erase operation is: Unmounting disk Wiping volume data to prevent future accidental probing failed Operation failed... It would then put up a dialog box saying: The disk you inserted was not readable by this computer. The three buttons on the dialog box include "Initialize", "Ignore", and "Eject". When I choose "Initialize" it would do nothing. I've tried this several times. Any ideas as to what may be going on? Or is the drive just bad? (I just got it from amazon.com today and it seems to work well-I just wanted two partitions.) Thanks!