On Jan 15, 2009, at 11:58 AM, Bruce Johnson wrote:

> Yes, just swap in the drives, OSX barely even notices.

The architecture of OS X is such that a boot drive originally  
installed on one machine is perfectly good on another machine, not  
necessarily of the same architecture.

I'm sure there are some limits, however.

It is my policy to only install so-called "universal" applications,  
for the very reason that those boot drives are often migrated to  
other machines.

The so-called "loader" function of OS X is capable if distinguishing,  
and of loading the proper instantiation of: PPC, PPC-64, Intel and  
Intel-64 applications, all on the relevant machine, from the same  
"universal" application file.

The same is true of many system components.



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