Clearing HDD media errors

I have a PowerEdge 1600SC that recently lost all of its formatting when it lost a disk.  I'm new to the organization so I don't know what, if any, level of RAID was set up but now I'm trying to reconfigure the system to RAID 5.  I have 1 disk that has 0 media errors and 4 others that have varying degrees of errors.   How can I - if it's possible - get the other disks to the point of 0 media errors so I can get them online and initiated as well.  I've cleared the data from them but that hasn't helped thus far.  I'm using the PERC/CERC BIOS configuration utility US 12 to manage the array with.  Thank you very much for any help.