I'm very confused on how you are accessing the UD disks. What is "UNASSIGNED"?
Your disk is mounted at /mnt/disks/. This is from the 'df' command in your diagnostics.
/dev/sdd1 1.9T 6.0G 1.9T 1% /mnt/disks/Lucky_Backup_Drive_Old
You said the drive was full, but it is only 1% used in the 'df' command.
If you are trying to access the drive with SMB, it is not set to be shared:
Mar 1 10:00:33 Hammerthread unassigned.devices: Mounting partition 'sdd1' at mountpoint '/mnt/disks/Lucky_Backup_Drive_Old'...
Mar 1 10:00:33 Hammerthread unassigned.devices: Mount cmd: /sbin/mount -t 'ntfs' -o rw,noatime,nodiratime,nodev,nosuid,nls=utf8,umask=000 '/dev/sdd1' '/mnt/disks/Lucky_Backup_Drive_Old'
Mar 1 10:00:34 Hammerthread ntfs-3g[31480]: Version 2022.10.3 integrated FUSE 27
Mar 1 10:00:34 Hammerthread ntfs-3g[31480]: Mounted /dev/sdd1 (Read-Write, label "Lucky Backup Drive Old", NTFS 3.1)
Mar 1 10:00:34 Hammerthread ntfs-3g[31480]: Cmdline options: rw,noatime,nodiratime,nodev,nosuid,nls=utf8,umask=000
Mar 1 10:00:34 Hammerthread ntfs-3g[31480]: Mount options: nodiratime,nodev,nosuid,nls=utf8,allow_other,nonempty,noatime,rw,default_permissions,fsname=/dev/sdd1,blkdev,blksize=4096
Mar 1 10:00:34 Hammerthread ntfs-3g[31480]: Global ownership and permissions enforced, configuration type 1
Mar 1 10:00:34 Hammerthread unassigned.devices: Successfully mounted 'sdd1' on '/mnt/disks/Lucky_Backup_Drive_Old'.
Mar 1 10:00:34 Hammerthread unassigned.devices: Device '/dev/sdd1' is not set to be shared.