This paper has provided details on the LE of the data on magnetic tape, hard-disc drives, flash memory, and optical discs. For archival purposes, only the M-DISC presently meets the requirement of long-term data retention (more than 100 years). This disc has been rigorously tested, and the results are very positive.The main weakness of the M-DISC is its relatively small capacity. This weakness is being addressed by our current research on a permanent solid-state solution, one whose density will enable a capacity of several terabytes in the format of a solid-state drive. Though it will be much more expensive than an M-DISC, the convenience of having several terabytes in a single, removable form of storage should be very attractive to the archival community.
Barry M. Lunt, Matthew R. Linford, Robert Davis, "Research on Another Permanent Data Storage Solution" in Proc. IS&T Archiving 2012, 2012, pp 19 - 22, https://doi.org/10.2352/issn.2168-3204.2012.9.1.art00005