nb23

Hey, so I am new here, and Im also looking to buy a z1 2 or 3. Not sure yet. But if I get the z1 or z2, I will be upgrading it to a z3. So my question is, obviously if i update the warranty will be void, BUT if I keep the original drive, and buy a new hard drive for the upgrade, is there anyway for them to find out I mod'd it? Also, if I get one, should I get the z1 or z2? It will be upgraded.