For the future wha I think it is promissing:
- Microsoft project Silica https://www.youtube.com/watch?v=-rfEYd4NGQg&list=WL&index=5
- 5D optical data storage https://en.wikipedia.org/wiki/5D_optical_data_storage
- DNA Data Storage. To use DNA to store vast amounts of digital data https://en.wikipedia.org/wiki/DNA_digital_data_storage