disk partitioning question.

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we want to put three os onto a hard disk is this possible do you have to partition the disk? how would you be able to select which one to boot?
this is for testing different os's and not have 20 different hdd.
 
You would need a separate partition for each OS, and every time you boot it would ask you to choose which one you want.

Alternatively you can to have several hard drives with one OS on each (on its own seperate partition). This way you can select which drive you want to boot from in the bios which removes the selection menu. Some people prefer to have the selection menu, others like the bios selection so windows boots up without needing any input.

You need at least 60 Gb for an OS partition these days, I have mine at 80 Gb and with Vista it only had about 15 Gb left, with Windows 7 there is 30 Gb left.
 
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It also matters what type of OS you are using. Will they all be Windows OSes or will you have Linux ones on there as well? This is important as will determine which to install first.

Generally install the oldest Windows OS first to the newest, otherwise you'll have to play around getting all the boot options to show up. Put any none Windows ones on last as they normally pick up the windows partitions automatically and take account for them.
 
If you're installing O/S for testing, wouldn't it be easier to do that on a virtual machine? I guess it depends how powerful your computer is.
 
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