Perfect. RESOLVED.
Thank you both (@ericmarceau and @ugnvs) for the assistance!
Between your examples and the reference material link, I was able to get my external USB drive to automount again, with the following steps:
- Used blkid to get the UUID value for /dev/sdb1
sudo blkid /dev/sdb1
/dev/sdb1: LABEL="WD500GB" BLOCK_SIZE="512" UUID="3E9E7FE16565DC4F" TYPE="ntfs" PARTUUID="4c03370-01"
- Add an entry to /etc/fstab for that device
sudo nano /etc/fstab
# added to the bottom of the file:
# Manual entry for WD500GB external USB drive
UUID=3D9E7FD16565DC4F /media/dagr2/WD500GB ntfs defaults,errors=remount-ro 0 1
Thanks to @Bombilla for the welcome, too.