Ok, this isn't an isolated issue - there are threads about this over at Apple and InsanelyMac:
I'm unable to install Snow Leopard. When I run the installer, it'll tell me that "Mac OS X cannot be installed on "Macintosh HD", because this disk cannot be used to start up your computer" (Macintosh HD being my OS X volume, obviously).
I'm seeing this issue on a relatively new 1.8ghz Macbook Air with a 128gb SSD - however, as far as I can tell from the other threads, the problem also affects iMacs and Macbooks.
Some people apparently attributed the issue to a PGP installation they had on their harddrive. Others found a file called backup.backupdb in their root - deleting it fixed the problem. However, most people don't have any of that installed on their computers and the upgrade still won't work.
So - if anyone has found a solution to the issue, please let me know :-( I'm stuck here. I don't have an external drive for the MBA and booting from a network drive has never worked on this particular machine - so I can't do a clean install, either.
Peter
I'm unable to install Snow Leopard. When I run the installer, it'll tell me that "Mac OS X cannot be installed on "Macintosh HD", because this disk cannot be used to start up your computer" (Macintosh HD being my OS X volume, obviously).
I'm seeing this issue on a relatively new 1.8ghz Macbook Air with a 128gb SSD - however, as far as I can tell from the other threads, the problem also affects iMacs and Macbooks.
Some people apparently attributed the issue to a PGP installation they had on their harddrive. Others found a file called backup.backupdb in their root - deleting it fixed the problem. However, most people don't have any of that installed on their computers and the upgrade still won't work.
So - if anyone has found a solution to the issue, please let me know :-( I'm stuck here. I don't have an external drive for the MBA and booting from a network drive has never worked on this particular machine - so I can't do a clean install, either.
Peter