To unmount you can use e.g. diskutil umount /dev/disk2s1 — if you get a message that unmounting failed then you can force unmounting with diskutil umount force /dev/disk2s1, although it recommended to close the apps that are using the files on the disk and retry without force.

Mounting as a regular user does not seem to work hence the need for sudo.

To unmount you can use e.g. diskutil umount /dev/disk2s1 — if you get a message that unmounting failed then you can force unmounting with diskutil umount force /dev/disk2s1, although it is recommended to close the apps that are using the files on the disk and retry without force.

Mounting as a regular user does not seem to work hence the need for sudo.

❗️ Known issues and limitations

Apparently, after waking from sleep mode ext4 fuse mounts stop working and trying to remount throws an error because the previous mount is still present. The workaround is to do a diskutil umount <mount_point> or diskutil umount force <mount_point> before remounting. An alternative workaround is to temporarily prevent sleeping while you are using the partitions with something like caffeinate -sdi.

NOTE: defer_permissions is needed in order to allow accessing the files from finder or terminal as a regular user.

1. Mount the partition to an existing mount point:

NOTE: _{-o allow_other,defer_permissions are needed in order to allow accessing the files from finder or terminal as a regular user.}

4. You might also need to add your user to the operators group:

# $USER is an ootb env variable that stores your mac user name
sudo dscl . append /Groups/operator GroupMembership $USER

2. Mount the partition to an existing mount point:

Once OSXFUSE and FUSE-EXT2 are installed you can mount the ext2/ext3/ext4 partitions as mentioned in other answers:

1. Find the device name for the EXT partition you want to mount (e.g. disk0s2 in the example below, (UPDATE) in later MacOS versions ext3/ext4 partitions might be labelled Microsoft Basic Data and not Linux):

Once OSXFUSE and FUSE-EXT2 are installed you can mount ext2/ext3/ext4 partitions as described in other answers:

1. Find the device name for the EXT partition you want to mount (e.g. disk0s2 in the example below, (UPDATE) in some MacOS versions ext3/ext4 partitions might be labelled Microsoft Basic Data and not Linux):