On x2gothinclients, when a usb-disk is added, a /media folder is created in the client's home directory, and the name of the inserted disk appears for a second in the /rm folder, and then disappears. Writes to /var /log /usb that the disk is mounted. The  syslog also contains an entry about the mounted disk, but judging by the x2gousbmount script, a file should also have appeared in /var/run/sdb1.mounted, which is not there.

There is a disk in the /media root, but the files are not there.

P.S. At the first mount, the usb-disk was, but did not show the files, as if it was empty. On next reconnections, the disk no longer appears. Other discs behave the same way.