From: Henrik.Carlqvist@deadspam.com   
      
   On Tue, 27 Sep 2022 13:15:25 -0400, Mike Small wrote:   
   >     1. create an ext4 fs   
   >     2. mount it   
   >     3. copy files to it   
   >     4. unmount it   
   >     5. remount it at a different point   
   >     6. access copied files.   
   >   
   > This sequence sometimes fails at step 5 and rarely in step 6.  Typically   
   > it does not fail. Could be a hardware error or something else (I'm   
   > always looking for a new thing to blame udevd on, for instance), but it   
   > sure would be nice (but not reassuring) if only a sync or two was what   
   > was needed.   
      
   Umount is supposed to sync the file system before unmounting and   
   returning.   
      
   As Bit Twister said, it might be a good idea to check the exit status of   
   all the commands and especially the umount commoand. Also look for error   
   messages from the commands and most of all, check for warnings and errors   
   in the output from dmesg when something like this goes wrong.   
      
   regards Henrik   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)