Can i have both leopard and snow leopard on the same partition?

Question

I have a MacBook Pro with 10.5. I want to install 10.6 and keep 10.5 on the same drive. The drive has only one partition. What problems might I encounter.

Answer 1

Yes you can, you could put the two in separate partitions to be safe.
Unless,  as Michael noted, you use VM software to run a different OS on the same  partition, impossible is the word you're looking for. Not safe.
He asked if you can or not. not safety advice. It's a simple yes or no. and yes you can. For all I am concerned, the man is an evil genius building an IT bomb before his final day after an untimely layoff. It's a yes or no question man. Did not ask your opinion on the highly unlikely event that he is able to go through the initial system checks and failsafes, and installation, and then the cosmic chance of success.  If you notice, the only thing I stressed was to get your backups. After that, go nuts.  It's how you learn.
Trigger a dependency issue that the OS tries to correct and it snowballs into a mess.
Is that supposed to mean something? Anything?
Are you by chance one of the apple-sticker-prius jockeys who deliberately close the door on me in the far left lane because you feel that every situation has a moral right and a wrong, and you're left to opine?  Except what's happening is I'm on my Yamaha and a you're technically attempting murder? I"m used to this guy.
         ALright say your mac OS =64 bit, but the hardware inside is 64 and 32. Off the top of my head- the Intel GMA chipsets are still running 32 bit drivers regardless of OS. Install 64bit on that machine and I think you're going to have issues with faulty driver dependencies where GMA spots a newer driver on the old 32bit partition vs. install disc. Youcan't fix this. By the time you start seeing errors, the OS has already tried fixing the dependencies by following down the 32 bit trail and dumping its own core. Try it if you don't believe me.
you want to fill the disk with zeros.
kadaggett (or anyone for that matter), do not follow this advice. It won't make a spit of difference how fast your  Mac will operate. The only purposes for a zero erase is to either try to  map out bad blocks that have developed (in which case, you should  replace the drive), or you're making it much more difficult for anyone  to recover deleted data.
          Right off the bat I think you should stay away from SSDs or perhaps run them in IDE mode to be safe. Or you'd bereplacing them every other day.  WHat I"ll be doing is allocating 10% to cache, playing with the trim, keeping it <50% full, and using 60GB cache to run my OS. You do what you like.  Send me your old HDD's though. Ever try formatting an SSD? And then it actually boots as if you hadn't formatted? Hey you thinkinn maybe sentient Macs experience phantom limb syndrome?
I find and fix bad blocks and realize 90% of them weren't bad. I don't know maybe the ghosts are back. But maybe it was static shock that temporarily crippled a few blocks. Can't know until touch it with a 0. And there is nothing wrong with 0s.  This is not 1987 and you are not going to hurt your What?  Don't order people to follow this or that advice - are you like the hall monitor around here?  WHy do you tell people what follow? Why do you assume they are here to follow? Do you feel like you just led people to the right path? You feelin good? Because I think we both look like ********.