Hello! I know this has been discussed in another forum but the responses were all 1+ year old. I have recently upgraded to El Capitan from an old IOS (my MBA is from 2011). Today, I was fiddling with Onedrive trying to upload some files from Buffalo Ministation 3.0 onto Onedrive so I don't have to store them on the laptop. I plugged in my Ministation....green light does not come on, MBA does not recognise it...nothing shows. I unplug from mains and unplug Ministation from lapton, plug all back in, reboot, restart, send to sleep, logout....and re-plug after each attempt. This time green light on Ministation comes on but is recognised only briefly - message comes up to say I had not ejected disk properly before. I know El Capitan had some issues in earlier versions with recognising external drives but I would have hoped they would have been fixed by 10.11.6? I tried the ministation on a Dell computer, and it is recognised with no issues (this time light is blue, not green but all files are intact) Can anybody shed some light on this please?