When mounting an (external) NTFS disk in FreeBSD, especially in TrueNAS right here, with write permissions (777 actually) you would do the following, which can also be found in the FreeBSD manual

# list currently attachded disks
geom disk list
# load fusefs
kldload fusefs
# or install, if not installed - then load like shown above
pkg install fusefs-ntfs
# make your mount directory for your disk, e.g.
mkdir /mnt/usb
# show the partitions on the disk, decide which one to mount, e.g. the first, 'da0s1'
gpart show da0
# ...and actually mount it, use ntfs-3g instead of 'mount'
ntfs-3g /dev/da0s1 /mnt/usb/
# and/or add an fstab entry for automagic mounting after boot
# /dev/da0s1  /mnt/usb	ntfs mountprog=/usr/local/bin/ntfs-3g,noauto,rw  0 0
# and unmount if you are done
umount /mnt/usb

Self-Monitoring, Analysis and Reporting Technology is a system for monitoring and recognizing errors of storage media like Hard Disk Drives (HDDs) and Solid State Disks (SSD).

All HDDs and SSDs (refered to as HDD in the following) have SMART functionality while some external drive cases do NOT support reading SMART values from the HDD directly.

Since SMART is not a standardised procedure or well-defined value collection, these values differ greatly between manufacturers and might indicate death for some hard drives while others do not even show or update said values.