Manufacturers of Hard Drives
Seagate / Maxtor; Seagate purchased Maxtor but still manufacturese drives under both names. Maxtor drives are generally more consurmer oriented while Seagate is for consumer and business application.
Hitachi, purchased IBM's drive business
Toshiba (also includes former Fujitsu)
Manufacturer's Hard Disk Utilities.
Seagate / Maxtor Utilities SeaTools
Western Digital Data Lifeguard for Windows