I have the Latest Imac 27 (I7 2600) and it will not read a Windows XP system disk. I have Parallels 6 with Windows 7, but I have some early legacy applications (Electronics Workbench 9) which need Widows XP to run. Apple has changed the firmware so a Windows XP system disk is ejected before I can create a vm in Parallels. Thus the latest, top end Imac will not allow Windows XP vm to run. I for one do not like this.