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I am not able to extend partition in windows server 2008. We have two different partitions which we want to join and make one partition. I came to know that basic disks have limitation of 2 TB each partition and we can create a maximum of 4 partition due to limitations.

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By the way, my answer is correct with regards to converting to Dynamic Disks, but you can't simply merge partitions like that. – Dan Jan 3 '13 at 11:20

Yes, your data will be fine, though you should always ensure your backups are maintained and up to date before doing such critical operations.

Here is a Technet article which will guide you through the process and some key considerations:

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I think minitool Partition Wizard do this

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