error code -50
Hi
I have a strange problem and I could not find the fix.I loose permissions to write on external hard drive after a while.when I start the session everything starts normal.But after a while I can not save anything on it or modify anything .And I cannot repair when it gets into this stage and whatever I do I get error code -50 .After a force eject and mounting again everything becomes as it should .
could anybody help me with this situation
mac os Sierra
peace