How to add new Raid 5 HD, I'm using Adaptec SCSI RAID 2120S.

Hope someone can help.
I'm using win 2000 server, adaptec SCSI RAID 2120S with raid 5.
Right now I have 1 system HD and 3 raid HD with data. I want to add one more HD.
Please tell me step by step what should I do. Thank you.
Who is Participating?
it depends on the raid is configured, on the array controller or in windows.
if you are using the hardware raid on the controller, you should use the adaptec solution,
if you are using the software raid in windows, you should use davy's solution.
kiiroweiAuthor Commented:
I'm using hardware riad. Base on adaptec solution. should I backup my data first? or can I just add new HD?
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