That will allow the likes of Apple to offer either slimmer, lighter music players or use the space freed up by the slimmer HDD to increase the size and capacity of the battery. Apple already uses Toshiba's 1.8in HDD family in the iPod.
Toshiba said that a two-platter, 80GB version should be available later this year. Both drives spin at 4200rpmm, and provide a parallel ATA-100 interface. Perpendicular technology is being pursued by a number of HDD manufacturers, with Seagate expected to release a 2.5in, 160GB perpendicular HDD for notebooks later this year.