Python | os.sync() method

OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system dependent functionality.

os.sync() method in Python is used to force write of everything to disk. This method allows a process to flush all dirty buffers to disk.

Difference between os.sync(), os.fsync(fd) and os.fdatasync(fd) method

os.sync() method force write of everything to disk where as os.fsync(fd) method force write of file associated with the specified file descriptor fd and os.fdatasync(fd) method is similar to os.fsync() method but it does not force update of file’s metadata.

Note: This method is only available on Unix platforms.

Syntax: os.sync()

Parameter: No parameter is required.

Return type: This method does not return any value.

Code: Use of os.sync() method





# Python program to explain os.sync() method 
# importing os module 
import os
# File path 1
path1 = 'file.txt'
# File path 2
path2 = 'file2.txt'
# File path 3
path3 = 'file3.txt'
# Open the files and get
# the file descriptors 
# associated with them
# using method
fd1 =, os.O_RDWR)
fd2 =, os.O_RDWR)
fd3 =, os.O_RDWR)
# Write a bytestring
str = b"GeeksforGeeks" 
os.write(fd1, str)
os.write(fd2, str)
os.write(fd3, str)
# Sync. all buffers to disk
# i.e force write everything
# to disk using os.sync() method
print("Force write everythig committed successfully")
# Close the file descriptors
# os.sync() method
# will flush all buffers
# to disk. 
# it may take a significant
# length of time



Force write of everything committed successfully


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :

Be the First to upvote.

Please write to us at to report any issue with the above content.