I have proof Leopard destroys hard drives
I have now installed Leopard on two PowerMac G5's in the same office, and both times the Leopard install has managed to permanently damage the hard drives. The first install wrecked the HD and I managed to recover nearly all data after purchasing and installing a replacement 500GB drive and copying over the old data. The second computer I completely backed up the pre-Leopard OSX data to an external drive, erased the original 160GB drive and installed Leopard. After the install, I transferred the external files onto the Leopard HD and the very same damage to the files (and apparently the HD) that was caused on the first machine was replicated on the second computer. I'm taking this complaint directly to Tim Cook. Leopard is a dangerously unstable install on anything other than a MacIntel, apparently. BEWARE!