I am trying to add an extra HDD on a Dell Poweredge 2400. It has a PERC 2/si RAID controller. It currently has a 9.1Gig HDD that is almost full and I want to add a 73Gig HDD. I installed and initialized the drive but it never was assigned a drive letter. I couldn't format it or use it, although I was able to see it using the "FAST" software. I am not using any type of mirroring. I just want extra HDD space. What am I doing wrong???