Anyone knows good software to resize C: of Windows Server 2003

Hi All,

Currently I have 3 disks on my server, running Raid, All I see is 5 partitions combine into one big disk space.

C:\ 10GB
F:\ 12GB
G:\ 12GB
H:\ 12GB
I:\ 9GB

Current OS: Windows Server 2003 Standard.

I need to expand C:\ of the Windows Server 2003 as there are more and more updates.

Solution, I need to purchase 2 HDD of the same size of the original 3 HDD, but how can I merge it to the C:\ partition?

Partition Magic is out of the question as it do not support Server OS.

Anyone have good solutions for me?

Thank you!