checked the shop ,they dont have it anymore,BEST WAY: Buy again the same enclosure you had before.
I have a lot of enclosure, all I can say, some enclosure work but don't work with certain HDS, This might be because some HDD drive have old firmware, so a possibility would be upgrading the firmware of your HDD and putting back in the new enclosure.
If still not detected, buy the same enclosure you had before.
did u use multiple enclosures with same hdd on wii u?