Re: re: No word on actual data transfer rates.
"I think Magneto Optic storage was good (I remember 3.5" Sony cartridges in 1990s with 250Mbyte)"
My experiences with MO were a bit disappointing, despite storing "guaranteed for 25 years" verbatim 5.25" cartridges at ~15C in sealed envelopes in a drawer they all developed fatal write errors within 18 months, across several batches of disc. The backup hard drives & CD-Rs I have from that same era (late 90s) still work perfectly so all was not lost... Spinning rust can surprise you in good ways sometimes. ;)