If you rip Blu-rays using MakeMKV the resulting file size can be huge. File sizes of Blu-ray movies in our collection range from 16GB to over 36GB. This was fine a year ago when we added an 8TB hard drive to our KODI server, but in less than a year we managed to whittle the free space on that drive down to 250GB. Buying more/larger drives is one approach to solving the free space problem, but we've already done this several times, going from a 1TB drive to a 2TB drive, then a 3TB drive, and another 3TB drive, before replacing them all with the 8TB drive. Another approach, the one we ulimately decided would be the right solution for us, was to encode those files - in this case using handbrake-cli, the command-line version of handbrake.