My best guess is that my son turned off my tv while it was recording live tv to that disk and then it stopped working.
Here is Ubuntu message
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Error mounting /dev/sdb1 at /media/ubuntu-mate/1959a9e4-f8bb-41b1-b531-fd2ccd7b818a: Command-line `mount -t "jfs" -o "uhelper=udisks2,nodev,nosuid" "/dev/sdb1" "/media/ubuntu-mate/1959a9e4-f8bb-41b1-b531-fd2ccd7b818a"' exited with non-zero exit status 32: mount: wrong fs type, bad option, bad superblock on /dev/sdb1, missing codepage or helper program, or other error
In some cases useful info is found in syslog - try dmesg | tail or so.
Thanks in advance