You don't need to delete it before the install - you can delete it and/or convert it directly to GPT in Windows once installed.
Question  - RAID and MD 1200I took over a system that was no longer in use.Dell R610 with 2 internal 146 GB Drives and a MD1200 with 6 600 GB Drives.There are two controllers – 6i PERC for the internal Drives,  6e PERC Adapter for the MD1200I initialized the internal drives to RAID1 and the MD 1200 to RAID 5 (5 drives and a spare) I loaded the Windows 2008 Server R2 DVD and booted the server to install Windows 2008.I want to install Windows on the RAID 1 internal drive.When I get to the screen to select a location, I see the followingDISK 0 Partition 1 2048 GB PrimaryDISK 0 Unallocated Space  185.5 GB DISK 1 Unallocated Space  136.1 GB DISK 0 looks to be the MD 1200But, what are the other 2 drives?I do not see the RAID 1 Drive I want to install Windows onto..
MD1200 RAID and Installing Windows