Great to hear it from a knowledgeable person like you. I had exactly the same impression; this was not like with installing it over Tiger. I've read recently that SL installation is by default Archive and Install rather than Erase and Install with previous cats. I recall that the general contention with Leopard was to erase the previous system and do a clean install.
P.S. I guess, the "upgrade disk" idea was also changed in SL. Previous upgrades did not offer some options; looks like this is a full-fledged OS disk.
Last edited by macnerd10; 10/26/09 10:34 PM.
Alex
3.1 GHz 13" MacBook Pro 2015, 8 GB RAM, OS 10.11.2, Office 2011, TimeWarner Cable
2.8 GHz Xeon Mac Pro 2010, 16 GB RAM, OS 10.11.2, Office 2011, LAN
| 
