add another disk to raid

hello i have server 2003 act as file server with two disk with mirror and 3 disk with raid 5 each one of them 72gb and i see thet i have problem with space now can i add another disk to the raid?and if yes how i do it and what i need to do?
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Pétur Ingi EgilssonSoftware Engineer -- ConsultantCommented:
Are you using Software RAID ( Windows created the RAID ) , If so.. then the answer is No.
You cannot expand RAID5 created by windows.

or hardware raid controller?
If hardware, what type of a controller are you using?

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buildingitAuthor Commented:
i using smart array controller
Pétur Ingi EgilssonSoftware Engineer -- ConsultantCommented:
From what company?
buildingitAuthor Commented:
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