Since the PERC 4 does not support non-RAID, you will need to configure that drive as a single-disk RAID 0.  This can be done in the CTRL-M utility during POST (be sure to also initialize the new logical drive after creating RAID 0) or from OMSA (OpenManage Server Administrator) in the OS (Storage, PERC, Information/Configuration (link at top of page), Create/New from dropdown menu).  Once this is done, then it will show up in Disk Management to be initialized and/or partitioned.
I have a Dell Poweredge 2600 and I want to add a single disk to the system as a backup drive. I already have 4 drives in a RAID 5 configuration. I would like to add this drive separate from the RAID 5 array. How would I go about doing this? I put the drive in the system but don't see it in Disk Management.
Poweredge 2600 Adding a Disk for backup purpose