Thank you Roger, I concur with your thoughts. And firstly Joe, it was jon's idea to go to IC help which I did but afterwards I went to nikon's D80 & somewhere in there was mention of not using a hub when connecting my camera to the computer and also to switch the camera off before disconnecting...I think I got that right , however as Roger remarked it is redundant so all is well. BTW, my hub is self powered.
Thank you guys, jaybass


OS 13.6.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. SuperDuper. 1 TB Lacie HD