Adding new USB External drive

I am trying to add a new 160gig Maxtor drive, using an external USB case onto a windows2000 server.

When I plug in the drive, the system recognizes the drive. When I go into Disk management, I see the drive, usually I would write click to start partitioning and formating the drive, but the only command I get is “write signature”

This is the first time adding a USB hard drive, can any one tell me or recommend a web site that gives step by step instructions? I can find many on how to so on a XP system, but nothing on Windows2000

Thanks