The Springtown facility currently fabricates its heads on wafers with a six inch (15.24 cm) diameter. Since July 2007, conversion has been underway to allow the use of larger eight-inch (20.32 cm) wafers. This requires a large investment—150 million euros over a period of three years, whereas the initial cost of the equipment for fabricating with six-inch wafers was 700 million euros. But as usual, this cost will be quickly recouped due to resulting gains in productivity. Seagate produces approximately 30,000 heads from a six-inch wafer, but 80,000 can be made from an eight-inch wafer.
Seagate is one of the rare producers of magnetic heads. Among the other hard-disk manufacturers, Hitachi and Western Digital also have their own fabs, whereas Toshiba, Fujitsu, Samsung, and ExcelStor use heads fabricated by TDK.