If one unmounts a disk, is that disk still available for write and can the following sync do anything?
[Solved]
I was under the impression that the sync command makes device removal safer somehow. Even though the device was unmounted, there may be cached data that wasn’t written yet. Could be wrong about that, but it seems harmless to include.
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Uhm, been a while since I had to think of this but pretty sure you used to need to do that the other way around. Sync before unmount, else things may still be being written to disk.
Surely an unmount forces a sync.
Yes to the first question. I could be wrong, but I think you have to run umount on the directory sdx is mounted on, not sdx itself.