Last week I started having issues with my late 2009 27" iMac 3TB HDD (very slow, then the screen just turns all grey, I'm assuming a hard drive failure). I rarely ever use my iMac, it just more of a storage unit for all of my movies, photos, etc. (about 2GB worth). I also have a WD 3TB external drive for time machine use. Can i just buy the Apple USB C adapter cable to charge my 2015 Macbook and have the external drive plugged in as well. Would it be that easy and/or worth it to make the switch. (Note: I also have an Airport Extreme and Apple TV that I use with it at home. Any thoughts???...