On Sun, 19 Nov 2017, Ronald Natalie wrote:

> You can’t mount a regular 9 track or many other types because they 
> weren’t block replaceable.  Once you wrote the superblock the second 
> time, you lost the rest of the filesystem.

So you mount it read-only...

-- 
Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will suffer."