My machine is a iMac8,1 (24", early 2008) that I bought with Mac OS 10.5 Leopard installed. My question is: what are all the benefits and drawbacks of performing a clean operation system (OS) install? Specifically a clean Lion install in contrast to an incremental upgrade plan.
What I already know:
- Upgrading to Snow Leopard and subsequently to Lion was easy and without loss of any data. I am aware of obsolete clutter being automatically removed in the processes (mostly PowerPC support), however, I can imagine that some is still present, e.g. Leopard and Snow Leopard system files that are now obsolete. They unnecessarily occupy space.
- Another arbitrary advantage of a clean install has more to do with ‘personal hygene’: old (third party) programs that I haven't used (and associated files) won't be re-installed.
- A third and last benefit of a clean install has to do with the physical space the OS occupies on the hard disk drive (HDD). Since the OS is practically the first thing on the disk it occupies the (faster) outer ‘rings’ of the HDD. That makes the OS faster than if it would occupy the inner rings. I presume that happens in the incremental upgrade as I did.
What are other advantages and disadvantages of a clean install? And are there any gaps or inconsistencies in what I already know?