apple hasn't touched hard drive firmware thing since OS 9. nowadays a fujitsu/toshiba/whatever hard drive with an apple sticker is just a fujitsu/toshiba/whatever hard drive

...unless you're dealing with warranty issues (which, as an Apple Specialist, I do every day), then a drive which shipped with an Apple machine is an Apple Drive and one which didn't is 3rd-party. Apple also doesn't make their own video cards, power supplies, and many of the other components inside their machines - they're contracted out to other companies - but they're branded with the Apple logo and ordered and shipped through Apple's distribution so they are all Apple parts. Even non-Apple branded Samsung RAM that ships with a machine is called Apple RAM because it's part of that config and warrantied through them.