Hello - I have more or less the same question.
I have a WD Passport external 2TB HDD which the Mac asked me if I wanted to use as a Time Machine and I said yes, and it seems to be backing things up in the background.
I am quite new to this iMac (2010, running El Capitan) and now have a second 2Tb WD Passport external HDD. I've used a Windows PC for years (now on Win 10) and I want to use this Passport as a sort of portable drive for my photographs and family history stuff. So need to format it so it can be read and written to by both Windows and Mac.
I've googled and found I need to format it first as FAT32, but this advice dates back to 2010-2012. Is the advice still the same? Should I still format it to FAT32 or have things changed since then?
Your advice would be much appreciated
