The problem you are describing was caused by a low-level device tool (like dd) writing blocks at the wrong size directly onto the device.
To fix this, you need to re-write the device blocks to the appropriate size. This can be done with dd. Double check your output device before running the command
sudo dd if=/dev/zero of=/dev/sdd bs=2048 count=32
Once the dd command is done, you should be able to access your device through gparted.