They were offered as an upgrade so some units that don’t say “SFX60+” on the front bezel may still have one installed. But if it says “SFX60+” instead of just “SFX60”. But the easiest and most definitive way to tell if it has one is for the owner to go into the system settings and check if it’s a +drive.
How to:
Turn it on
press FUNCTION + GLOBAL to open the global menu
press ENTER/YES to enter the GLOBAL MENU
Scroll down to “FILE”
if you see the sub menu titled “+DRIVE” like below, it has one. If this area is empty, no +DRIVE