'How can I get partition mounted ? "mount: /Volumes/mytest failed with 71"

The exfat partition of my external drive is not mounted automatically on my mac. I created a /mytest directory in the /Volumes directory and tried to mount it, but I get the following error and cannot mount it. This works for everything else, but I cannot mount this partition. How can I get it mounted?

sh-3.2# diskutil list rdisk7
/dev/disk7 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *8.0 TB     disk7
   1:         Microsoft Reserved                         16.8 MB    disk7s1
   2:       Microsoft Basic Data myexfhdtosi             4.4 TB     disk7s2
   3:       Microsoft Basic Data                         1.6 TB     disk7s3
   4:                  Apple_HFS myhfshddtosi            1000.0 GB  disk7s4


sh-3.2# mount -v  -t exfat  /dev/rdisk7s2 /Volumes/mytest
mount_exfat: /dev/rdisk7s2 on /Volumes/mytest: Block device required
mount: /Volumes/mytest failed with 71


Solution 1:[1]

Try killing the fsck service and mount again.

sudo pkill -f fsck

See this thread for detail discussion.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 j23