Samsung and WD are selling 9mm (standard height) 1TB drives, and have done so for almost a year. I think Toshiba or Hitachi recently released a 7mm (extra slim)

Samsung and WD are selling 9mm (standard height) 1TB drives, and have done so for almost a year. I think Toshiba or Hitachi recently released a 7mm (extra slim) 750GB drive. Seagate has been selling extra thick (15mm) 1.5TB drives, but only inside external enclosures, for some time now. Many laptops will also accept the thick 12mm drives you're referring to.