My seagate disk that was detectable earlier is now showing SMART status "not supported". Anyone experienced similar thing before? External hard disk seagate is not readable suddenly and when i click on "Initialize", i am taken to Disk Utility which among other things also says "S.M.A.R.T status" isnt supported. What options do I have now?

I have already verified but i get the error invalid b-tree node size. 
Thanks .
I haven't seen an external drive where SMART was supported, so you can probably ignore that aspect and just focus on the rest of the information you can obtain about the drive's health.