man pages of
sync All I/O to the filesystem should be done synchronously. In the case of media with a limited number of write cycles (e.g. some flash drives), sync may cause life-cycle shortening.
Does this mean that when providing this option in
/etc/fstab (given the following definition of
$ sync --help Usage: sync [OPTION] [FILE]... Synchronize cached writes to persistent storage
...caching of contents (i.e. of memory pages created from the contents of the particular device) is prohibited?