EBAN is a enterprise version of dban and widely used open source data removal and destruction software. I would recommend DBAN if cost is an issue. DBAN will wipe the harddrive clear of any data on them by writing over the disk multiple times with 1s and 0s. I wrote a review on dban and wipedrive. Wipedrive is commercial software used by government agencies. They don’t cost to much and are easy to use.
SCSI Hammer will process 30 drives at once while they remain in the enclosure and you can see a short video of the basic operation here.
This product meets the NIST 800-88 guidelines and if you need more information please feel free to contact me.