Splitting a file .Mkv into two parts?

I know that we can split a file. Mkv two parties without losing quality? but has heard that we may lose the quality by splitting?

So can anyone tell me how to achieve the quality while splitting..

Thanks in Advance

mkv toolnix / merge works in native format.. mkv then no recoding, but works in its original format.

Very good, in fact the quality of the original file and file splitting I feel the same.

Thank you

It does not appear, it is?
Normally I do not have these problems, who the user should realize the size and then adjust accordingly on the audio compression \ video.