I find that CD's vary between 300MB-550MB using FLAC at compression #5

So, another way to scale it is to use averages

For example, I have 511GB with 21556 files in one of my folders just for 44.1k FLAC

This gives an average of 24MB per track (including pro-rata artwork)

A ripped DVDA folder has 587 files for 45.8GB => 78MB per track

Individual file size of course varies a lot with both CD and DVDA as does number of tracks per disc.

Scale the maths to see what you need if you guess at average number of tracks per disc.

Failing that....rip it all and report back smile

Rgds,
Nick