Although I don't have exact numbers with me, an installation of CSDS with it's all data files is probably between 30 and 40 MB.

Music files will eat up your hard disk space more than CSDS or more than cue sheets.

A mono MP3 file for a typical square dance tune of 3 to 4 minutes is about 2MB or so. A stereo file is twice that much.

I currently have 3648 (mostly mono) MP3 files in a folder on my laptop. These files take up 6.2 GB of space. Hence a GB will hold about 588 MP3 files.

I recommend that you get a laptop with a hardrive of at least 20 GB.