Hi, how many gigabytes should I allocate for linux? This goes for in case I don't like one linux flavour, then I install another one. So, 5GB partition would be fine?

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I'd recommend more like 20gb, if you have the space. Linux distributions usually come with lots of applications (this can vary significantly), and if you want a complete install, then you MAY need this much space. 5 gb will generally work if you do a standard "desktop installation", in which case not all included applications will be installed (they can be installed individually later, however).

Don't forget about a swap partition, as well, if you have less than 512 Meg RAM or so. If you only have 128 Meg, for instance, you will probably want a 128 or 256 Meg (1/4 gig) partition. If you have 512 Meg or more, you MAY not need a swap partition (I have 512 and don't use one, but it appears necessary on my 128 Meg machine).

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Dont forget to activate your designated partition if you dont want to use a boot disk and have an auto install from the hard druive--do this using FDISK

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I agree with C_Legend, give as much as you can....even better if you can dedicate a whole hard drive to GNU/Linux.
(Not to sure about NOT using a swap partition though, but then again if you have the RAM...?)

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