Here is my issue and I hoping that there is someone out there that has an answer so I don't end up stuck here at my co-location all day.

Last night I came here and upgraded a server (Dell 2970) to have four 1TB Hard Drives in RAID 5 which leaves a 3TB block. I tried to partition this but keep getting an error that GPT is not supported so I found a site online telling me I need to run the dd command and right random data to /dev/sda. This is great (if it works) but taking forever. I have two more machines to upgrade today and not a chair in site. Does anyone have advice on how I can avoid this issue beforehand?

Thank You for your advice and support.