[CentOS] How to add a HD to a LVM

I have connected a HD that was a prior system drive (Centos 4.8) 
and I am not sure of the command line procedures to find out if 
it is recognized (I believe it is since it present in the GUI), 
delete all data on it and finally add it to the LVM.

I would like to use it as a backup data drive.

Todd

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Ariste Software
Petaluma, CA 94952

http://www.aristesoftware.com