Steam updating a
Now it is time to test whether there are bad sectors on the drive bringing Steam disk write error Windows 10/8/7. Select the disk that has Steam installed and reports Steam disk write error and then choose Surface Test from the Check Partition group. In the new emerging window, click Start Now on the top right corner to begin the check.Note that if there are read errors found, they will be marked with red color.Please restart Steam and then repeat the downloading/upgrading.If the Steam disk write error persists, restart your computer then.
Needless to say, restarting is always the first trying.Go to the file location of Steam (default location is C:/program files/Steam). Head to the Compatibility tab in properties and make sure "run this program as an administrator" is ticked. In short, he just solved this issue by going into Program Files (x86)/Steam/steamapps/common and simply deleting a file titled Fallout that was 0KB in size.