The version I’m playing came on 2 5.25’s but I have obviously installed it to hard disk. I guess if you are saving the data along with the planets themselves, it still works when split across a couple of disks.
There is a whole lot of game for so little data. I’ve started following the plot now. I won’t give too much away here but the clue that vede mentioned does point you toward somewhere else to go via a message in a ruin. I didn’t get all that far into that particular quest but ran into others when talking to some aliens who intercepted me along the way. The conversation system isn’t massively complicated but the aliens are really chatty once you get them started. There is way, way more text than I expected. A lot of it appears to just be for atmosphere/background but there are loads of clues to places to explore in there as well. This part of the game seems to be like one big treasure hunt.