A:Answer You can replace the SATA drive with a SATA 2.5" SSD. Use a SSD maker's website to check compatibility. Also, disregard the "it's not upgradable and it'll void the warranty". US federal law (Mag-Moss Warranty Act) allows for you to service your own system and won't void the warranty - unless you damage it.* The upgraded component won't be covered by the laptop warranty, rather it'll be covered under its own warranty. Also, you can upgrade the RAM too.
*I'm not a lawyer. Manufacturers try to make you believe it'll be voided but that isn't the case. It's a scare tactic they use to make you pay more for another model or for their own upgrade. Upgrade/service at your own risk as damages won't be covered. The FTC has plenty of information on this. Do a quick web search on the law or contact the FTC if uncertain. If not comfortable with doing the upgrade, Geek Squad can do the service for you.