Would it violate the TOS to install a third party hard drive?

Is it a violation of apples terms of service to replace the factory installed hard drive with a larger third party one?

I understand that it is a violation of the terms of service to install OSX on non-apple hardware and I was wondering if installing a third party hard drive would be a violation. If so would I need to buy a first party hard drive directly from apple, or is it completely taboo to poke around inside an apple product?