[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. 

**The commands and usage of the drive is independent of the generation.**

It would be more useful to add a different tag to a question than to use `lto` + `lto-4` for example.


Differences are mostly

* higher speed and larger cartridges for newer generations 
* hardware encryption since LTO-4

But these differences are not critical to categorize the questions.
The user will provide the required details (software, LTO generation...) in the question.

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