sudo fsck /dev/sdd
I believe this command was incorrect. sdd is the entire disk (itself isn't a valid partition). sdd1, sdd2 are the partitions, which might explain the superblock error.
How is the disk being mounted (e.g. click in the Caja sidebar)? Do you get the same error if you manually mount? Maybe also try the ro option for read-only:
sudo mount -o ro /dev/sdd2 /mnt
The error could happen if you don't have the NTFS driver installed, or it's been blacklisted. I think one of the packages providing NTFS support is ntfs-3g.
Generally, for NTFS filesystem errors, I think running chkdsk /F X: on Windows (its native environment) is better to fix them - if the issue is due to some inconsistency.