Linux filesystems *NOT* supported by My Cloud?

My Cloud OS 3 Personal & Network Attached Storage My Cloud
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That does not exist in the current 2.n firmware.

Viz.:

Using the method suggested by Domemvs,

. . . the machine appears to shut down, but does not appear to cleanly unmount the filesystem first, resulting in a “Power” warning in the webmin page when you log in again, and it spends a while fsck’ing the system.

More research is needed.

Jim “JR”