Trying to install 10.3 for the first time on my iMac 800, 80gb, 512mb. I booted up using my retail version of 10.3, went to Disk Utility and started to erase the disc, ticking the options for zero all data and the second option (can't remember what it is). I started the erase 3 1/2 hours ago and Disk Utility has stopped on 'Preparing to write random data to disk' for about an hour and a half, possibly more. I tried to quit Disc Utility and it said that it may make the disc unusable if I quit. I understand ticking these options takes longer, but how long? Should I leave it? Or, if I quit could it do damage to the disc or will I simply be able to format it normally after quitting?