I went to IBM, Support, Storage, Hard Disks and got this page:
The program is "Drive Fitness." The first part of it says it just tests the drive, but the second part says
Restores drive fitness (overwrites customer data)
* Erase Bootsector utility
(use DFT Utility option: Erase Boot Sector)
* Low-level format utility
(use DFT Utility option: Erase Disk)
Note: Both utilities will overwrite all customer data and allow repair of bad sectors.