Apparently, Silicon Graphics (SGI) made another filesystem EFS (Extent File System) before their more popular XFS (eXtent (?) File System). The Linux kernel has a read-only implementation of EFS. It looks to have been added ? Despite the risk associated with these unmaintained filesystem drivers, GNOME (via Nautilus) continues to automatically mount untrusted USB drives.
It will be interesting to see how Linux evolves to confront this problem.
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