I have a version of mac os x that can run on a pc. I have looked into installing the file with ubuntu. I have learned this shell command dd bs=1048576 if=./tiger-x86-flat.img of=/dev/hda , but you have to unmount the drive to not get an access denied error. When I unmount the drive and type in the command I get an error message that the directory now does not exist. How can I get this to work?