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As I only have one PC at home I try to un-install one before installing a new one. As I don't know how to un-install the Linux OS I resort to using the Disk Management of Windows OS to delete the partition containing Linux and also the partition containing Windows. I now have to re-install Windows and re-install Linux.
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No need to delete windows. After deleting the Linux partition, insert your windows CD. Somewhere will be an option to fix the MBR which will remove Grub. Just go through the different options that are offered.
Further I doubt that there's a need to delete Linux (see below). As far as I know there's no need, even when you want to give it back to Windows.
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Can someone suggest a better way of installing a different version of Linux without having to delete all the OS in PC?
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Just install it. It will allow you to erase partitions, create new ones etc. Just make sure not to wipe windows partitions.
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A related question: Can we install two or more different versions of Linux OS in a single PC with 2 hard drives each with 2 partitions made from Windows OS?
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One can install 10's or 100's of different distro's on one system.
My suggestion (for Windows 2000/XP)
drive 1, partition 1 for Windows and programs (NTFS)
drive 1, partition 2 for Windows data (NTFS)
drive 1, partition 3 for data exchange (FAT32, a few GB is enough)
drive 2, partition 1 for Linux 1
drive 2, partition 2 for Linux 1 data (home directory)
drive 2, partition 3 for Linux 2
drive 2, partition 4 for Linux 2 data (home directory)
drive 2, partition 5 for Linux swap (twice the memory or max 1GB (whatever comes first)
If you use Windows ME or earlier, you don't need the third partition on the first drive and the given filesystems don't apply (will always be FAT32). The third partition is there to more easily share files between the different operating systems. Linux support for NTFS is risky (when writing).
The size of the Linux swap partition is debatable. Lot's of people will say that 512MB (or even 256) is enough. I use 1 GB.
You don't say how big the drives are, so further advise is a bit difficult. It depends on the distro how much space you need. A full Slackware install takes about 3.5 GB, a full Suse install will probably do more (no experience). You need to keep some space for updates and additional software that you might need and some space for data. So around 10 GB will be OK for one distro for now.
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the given partitioning scheme is one of many options. You can also decide to put all OSes on one disk and all data on another.
If you just want to play in Linux for now, you can omit the Linux data partitions. The home directory will then be on the partition where you install Linux.