Question about migration from old 2007 Imac
I have asked this question, in different forms previously and the board was gracious in tolerating my ignorance and repetativeness; in talking with a friend of mine, I told him that I was going to attach my EVO 1 TB SSD that I used in my old 2007 Imac, to my new Imac with a sata connector to Thunderbolt, another external 1 TB drive I used for my Time machine backups on my 2007. I wanted to use the SSD for most of my programs that are still on it and the TM drive for continued TM back-ups. As well, I purchased a 8 TB WD backup for all three HD's, i.e. new imac, ssd and tm drive; I made mention that I was going to use the Evo to access some programs that I used on my previous Mac. He said that I can't do that because that Evo drive has an OS on it and that will cause a conflict with the new Imac OS. Is this true?
Another concern: I understand that when I want to use the external HD for the time machine portion, the new Imac wil ask me 'do u want to 'inherit' this TM drive for the new computer?'. If I do this, I understand that I will not be able to ever use the HD on the originating computer (though it is toast anyways'). My question is, will it still keep all the TM backups from my original computer or will that all go bye bye?
For the record, my New Imac is w/ 1 TB SSD, 40 GB ram.
I pray this is coherent. Forgive me, if not.