@JSWolf, thanks for the suggestion! I just installed Calibre 2.78 64bit in Win10 and it works fine with the Sony PRS650. A reboot in Fedora with the same Calibre version still refuses to connect to the reader. Manually adjusting the mount-options to ignore errors (was remount-ro) does not help either... currently the READER partition is mounted as
Code:
/dev/sdj on /run/media/user/READER type vfat (rw,nosuid,nodev,relatime,uid=1000,gid=1000,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,showexec,utf8,flush,errors=continue,uhelper=udisks2)
but still the same error in in the logfile as above listed.
Any other ideas?