How many Operating Systems allowed in a single computer

How many operating systems are allowed in a single computer. Is any extra RAM is need for each extra operating system?

Answer

No extra RAM needed, just enough hard drive space (or hard drives) to hold them all.

There is no limit... using boot loaders and similar technologies, you can simplyfy the process - When I was a younger geek, I used to think it was cool having everything from Windows 3.1 to XP and a few flavors of Linux on the same machine....

...As I grew older, I realised it was just a waste of time and a maintenance nightmare.

If you want multiple operating systems, I highly advise you stick with one and explore technologies such as virtualisation which will allow you to run multiple Operating systems from within one without all the headaches.

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