write-region-inhibit-fsync

write-region-inhibit-fsync is a variable defined in `C source code'.
Its value is

t

Documentation:
Non-nil means don't call fsync in `write-region'.
This variable affects calls to `write-region' as well as save commands.
Setting this to nil may avoid data loss if the system loses power or
the operating system crashes. By default, it is non-nil in batch mode.