[Linear tape open][1] is a famous tape drive technology. 

The LTO Consortium defines the new generations LTO-1, LTO-2... from time to time. It makes sense to merge all tags to `lto`, because the the version number does not name something completely different. 
It would be more useful to add a different tag to a question than to use `lto` and `lto-4` for example.


  [1]: https://en.wikipedia.org/wiki/Linear_Tape-Open