I’ve been reading a few posts about this, but still haven’t gotten any traction. I’m convinced I’m dealing with my options getting overridden.


I have an exfat mounted drive on a Raspberry Pi 4. I have two users, root and dietpi.

I want to mount the exfat drive so that the user dietpi can read and write to all the files in the drive.

I’ve sudo apt install exfat-fuse, and I have a line in my /etc/fstab:

/dev/sda1 /home/dietpi/filerun/user-files/ auto fmask=0777,user,noauto 0 0

I understand that this lets me run mount /dev/sda as a non root user (as dietpi) which is great.

But then the permissions when I ls -l that directory are as follows:

drwxr-xr-x  9 root   root  131072 Mar 19 04:07 user-files

The file are there, root can read/write to them. But not dietpi - it can only read, as the permissions show. Note that before I mount, this is what ls -l shows:

drwsrwxrwx  9 dietpi   dietpi  4096 Mar 19 04:07 user-files

I understand that with exfat drives, it defaults to root when you mount a directory as exfat drives have no notion of permissions. I cannot chown user-files to dietpi, either after it’s mounted.

If I print mount, what’s interesting is that it shows fmask=0222,user=dietpi. So the user is not root, which is good, but the fmask is not what I expected it to be. Is it getting overridden?

$ mount
/dev/sdal on /home/dietpi/filerun/user-files type exfat (rw, nosuid, nodev, noexec, relatime, fmask=0022, dmask=0022, jocharset=utf 8, errors=remount-ro, user=dietpi)
  • 1
    This question doesn't seem to belong here - not specific to Raspberry Pi, should go to Linux community
    – Vadim
    Mar 19 at 19:09

1 Answer 1


The following worked, but ONLY after a restart (sigh..):

UUID=XXXX-XXXX /path/to/mnt/dir exfat users,exec,rw,suid,dev,atime,diratime,uid=1000,gid=1000,umask=000 0 0

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