Merging NTFS partition !!

Hi,

There are 4 NTFS partitions on my Laptop. My laptop is running windows2000 pro. The C-drive is running out of space now. Can I merge C-drive with let say D-drive or do we have to use software like Partition magic? A friend told me that wecan merge 2 NTFS partition using disk management in WinNT4.0 server. Please suggest.

Regards,
Edmond