Ordered a 13" MB Pro and wanted to upgrade HD to 500 Gigs. The authorized reseller agent suggested the vendor's branded HD (probably Hitachi or Seagate) which was $150 less than Apple's, installed. My question is, will the Sudden Motion device which lifts head of HD during 'drops' stay active when a non-Apple HD is installed? I realize Apple will not warranty this HD as it is not their own but would like some extra assurance re: drop protection.