Mad_Cyril I keep the majority of my digital music collection (stuff I rarely listen to) on a couple of mirrored eternal hard drives. I’ve never tried using them with rekordbox. I haven’t even looked into it, mainly due to the fact that I assumed there would be an issue with latency.
I suggest you do what I did in the spring. Tell your Mrs that you need to splash out on a new super-duper laptop, with a massive SSD.