Like Lil said, the first one makes sense with digital data. -meaning: the computer sees all types of data that are digits The second one makes sense, and is the one I would choose. -meaning: that all data is converted to digits by the computer * don't forget to add "a" or "the" before "computer". Since you are not using a proper noun in these sentences you need the articles. The- if you are talking about a specific computer a- if you are talking about computers in general

The first sentence makes sense if said 'digital data.' And the second sentence makes sense as well, but because the subject you're talking about is a computer, you don't have to say that the computer sees data digitally.

It depends on what you want to say. How does the computer see the data?This is the second one. Or what kind of data does the computer see. Here I would use the first one, but I would put digital in front of the noun data.